We are pleased to announce that we have selected the highly cited articles published in 2021 and 2022, which you are welcome to read.

1. “On Sombor Index”
by Kinkar Chandra Das, Ahmet Sinan Çevik, Ismail Naci Cangul and Yilun Shang
Symmetry 2021, 13(1), 140; https://doi.org/10.3390/sym13010140
Available online: https://www.mdpi.com/2073-8994/13/1/140  

2. “On the Hybrid Fractional Differential Equations with Fractional Proportional Derivatives of a Function with Respect to a Certain Function”
by Mohamed I. Abbasa and Maria Alessandra Ragusa
Symmetry 2021, 13(2), 264; https://doi.org/10.3390/sym13020264
Available online: https://www.mdpi.com/2073-8994/13/2/264

3. “Determination of Objective Weights Using a New Method Based on the Removal Effects of Criteria (MEREC)”
by Mehdi Keshavarz-Ghorabaee, Maghsoud Amiri, Edmundas Kazimieras Zavadskas, Zenonas Turskis and Jurgita Antucheviciene
Symmetry 2021, 13(4), 525; https://doi.org/10.3390/sym13040525
Available online: https://www.mdpi.com/2073-8994/13/4/525

4. “Numerical Investigation of Fractional-Order Swift–Hohenberg Equations via a Novel Transform”
by Kamsing Nonlaopon, Abdullah M. Alsharif, Ahmed M. Zidan, Adnan Khan, Yasser S. Hamed and Rasool Shah
Symmetry 2021, 13(7), 1263; https://doi.org/10.3390/sym13071263
Available online: https://www.mdpi.com/2073-8994/13/7/1263

5. “Different Faces of Generalized Holographic Dark Energy”
by Shin’ichi Nojiri, Sergei D. Odintsov and Tanmoy Paul
Symmetry 2021, 13(6), 928; https://doi.org/10.3390/sym13060928
Available online: https://www.mdpi.com/2073-8994/13/6/928

6. “Study of Cascading Failure in Multisubnet Composite Complex Networks”
by Gengxin Sun, Chih-Cheng Chen and Sheng Bin
Symmetry 2021, 13(3), 523; https://doi.org/10.3390/sym13030523
Available online: https://www.mdpi.com/2073-8994/13/3/523

7. “On the Arcsecant Hyperbolic Normal Distribution. Properties, Quantile Regression Modeling and Applications”
by Mustafa Ç. Korkmaz, Christophe Chesneau and Zehra Sedef Korkmaz
Symmetry 2021, 13(1), 117; https://doi.org/10.3390/sym13010117
Available online: https://www.mdpi.com/2073-8994/13/1/117

8.“New Hermite–Hadamard Inequalities in Fuzzy-Interval Fractional Calculus and Related Inequalities”
by Muhammad Bilal Khan, Pshtiwan Othman Mohammed, Muhammad Aslam Noor and Y. S. Hamed
Symmetry 2021, 13(4), 673; https://doi.org/10.3390/sym13040673
Available online: https://www.mdpi.com/2073-8994/13/4/673

9. “Fuzzy Differential Subordinations Based upon the Mittag-Leffler Type Borel Distribution”
by Hari Mohan Srivastava and Sheza M. El-Deeb
Symmetry 2021, 13(6), 1023; https://doi.org/10.3390/sym13061023
Available online: https://www.mdpi.com/2073-8994/13/6/1023

10. “Applications of the q-Srivastava-Attiya Operator Involving a Certain Family of Bi-Univalent Functions Associated with the Horadam Polynomials”
by Hari Mohan Srivastava, Abbas Kareem Wanas and Rekha Srivastava
Symmetry 2021, 13(7), 1230; https://doi.org/10.3390/sym13071230
Available online: https://www.mdpi.com/2073-8994/13/7/1230

11. “General Fractional Integrals and Derivatives of Arbitrary Order”
by Yuri Luchko
Symmetry 2021, 13(5), 755; https://doi.org/10.3390/sym13050755
Available online: https://www.mdpi.com/2073-8994/13/5/755

12. “Condensing Functions and Approximate Endpoint Criterion for the Existence Analysis of Quantum Integro-Difference FBVPs”
by Shahram Rezapour, Atika Imran, Azhar Hussain, Francisco Martínez, Sina Etemad and Mohammed K. A. Kaabar
Symmetry 2021, 13(3), 469; https://doi.org/10.3390/sym13030469
Available online: https://www.mdpi.com/2073-8994/13/3/469

13. “A New Analysis of Fractional-Order Equal-Width Equations via Novel Techniques”
by Muhammad Naeem, Ahmed M. Zidan, Kamsing Nonlaopon, Muhammad I. Syam, Zeyad Al-Zhour and Rasool Shah
Symmetry 2021, 13(5), 886; https://doi.org/10.3390/sym13050886
Available online: https://www.mdpi.com/2073-8994/13/5/886

14. “Applications of Certain Conic Domains to a Subclass of q-Starlike Functions Associated with the Janowski Functions”
by Bilal Khan, Hari Mohan Srivastava, Nazar Khan, Maslina Darus, Qazi Zahoor Ahmad and Muhammad Tahir
Symmetry 2021, 13(4), 574; https://doi.org/10.3390/sym13040574
Available online: https://www.mdpi.com/2073-8994/13/4/574

15. “Neutral Delay Differential Equations: Oscillation Conditions for the Solutions”
by Omar Bazighifan, Hammad Alotaibi and Abd Allaah A. Mousa
Symmetry 2021, 13(1), 101; https://doi.org/10.3390/sym13010101
Available online: https://www.mdpi.com/2073-8994/13/1/101

16. “Three Symmetrical Systems of Coupled Sylvester-like Quaternion Matrix Equations”
by Mahmoud Saad Mehany and Qing-Wen Wang
Symmetry 2022, 14(3), 550; https://doi.org/10.3390/sym14030550
Available online: https://www.mdpi.com/2073-8994/14/3/550

17. “A Novel Numerical Approach in Solving Fractional Neutral Pantograph Equations via the ARA Integral Transform”
by Aliaa Burqan, Rania Saadeh and Ahmad Qazza
Symmetry 2022, 14(1), 50; https://doi.org/10.3390/sym14010050
Available online: https://www.mdpi.com/2073-8994/14/1/50

18. “Fractional View Analysis of Kuramoto–Sivashinsky Equations with Non-Singular Kernel Operators”
by Azzh Saad Alshehry, Muhammad Imran, Adnan Khan, Rasool Shah
Symmetry 2021, 13(4), 525; https://doi.org/10.3390/sym13040525
Available online: https://www.mdpi.com/2073-8994/13/4/525

19. “Novel Oscillation Theorems and Symmetric Properties of Nonlinear Delay Differential Equations of Fourth-Order with a Middle Term”
by Barakah Almarri, S. Janaki, V. Ganesan, Ali Hasan Ali, Kamsing Nonlaopon and Omar Bazighifan
Symmetry 2022, 14(3), 585; https://doi.org/10.3390/sym14030585
Available online: https://www.mdpi.com/2073-8994/14/3/585

20. “Timelike Circular Surfaces and Singularities in Minkowski 3-Space”
by Yanlin Li, Fatemah Mofarreh and Rashad A. Abdel-Baky
Symmetry 2022, 14(9), 1914; https://doi.org/10.3390/sym14091914
Available online: https://www.mdpi.com/2073-8994/14/9/1914

21. “The Numerical Investigation of a Fractional-Order Multi-Dimensional Model of Navier–Stokes Equation via Novel Techniques”
by Safyan Mukhtar, Rasool Shah and Saima Noor
Symmetry 2022, 14(6), 1102; https://doi.org/10.3390/sym14061102
Available online: https://www.mdpi.com/2073-8994/14/6/1102

22. “On Odd Perks-G Class of Distributions: Properties, Regression Model, Discretization, Bayesian and Non-Bayesian Estimation, and Applications”
by Ibrahim Elbatal, Naif Alotaibi, Ehab M. Almetwally, Salem A. Alyami and Mohammed Elgarhy
Symmetry 2022, 14(5), 883; https://doi.org/10.3390/sym14050883
Available online: https://www.mdpi.com/2073-8994/14/5/883

23. “A Comparative Study of the Fractional Coupled Burgers and Hirota–Satsuma KdV Equations via Analytical Techniques”
by Humaira Yasmin and Naveed Iqbal
Symmetry 2022, 14(7), 1364; https://doi.org/10.3390/sym14071364
Available online: https://www.mdpi.com/2073-8994/14/7/1364

24. “The Characterizations of Parallel q-Equidistant Ruled Surfaces”
by Yanlin Li, Süleyman Şenyurt, Ahmet Özduran and Davut Canlı
Symmetry 2022, 14(9), 1879; https://doi.org/10.3390/sym14091879
Available online: https://www.mdpi.com/2073-8994/14/9/1879

25. “The Dual Expression of Parallel Equidistant Ruled Surfaces in Euclidean 3-Space”
by Sümeyye Gür Mazlum, Süleyman Şenyurt and Luca Grilli
Symmetry 2022, 14(5),1062; https://doi.org/10.3390/sym14051062
Available online: https://www.mdpi.com/2073-8994/14/5/1062

26. “An Exact Solution to a Quaternion Matrix Equation with an Application”
by Long-Sheng Liu, Qing-Wen Wang, Jiang-Feng Chen and Yu-Zhu Xie
Symmetry 2022, 14(2), 375; https://doi.org/10.3390/sym14020375
Available online: https://www.mdpi.com/2073-8994/14/2/375

27. “A Comparative Analysis of Fractional-Order Kaup–Kupershmidt Equation within Different Operators”
by Nehad Ali Shah, Yasser S. Hamed, Khadijah M. Abualnaja, Jae-Dong Chung, Rasool Shah and Adnan Khan
Symmetry 2022, 14(5), 986; https://doi.org/10.3390/sym14050986
Available online: https://www.mdpi.com/2073-8994/14/5/986

28. “Some Fuzzy Riemann–Liouville Fractional Integral Inequalities for Preinvex Fuzzy Interval-Valued Functions”
by Muhammad Bilal Khan, Hatim Ghazi Zaini, Jorge E. Macías-Díaz, Savin Treanțǎ and Mohamed S. Soliman
Symmetry 2022, 14(2), 313; https://doi.org/10.3390/sym14020313
Available online: https://www.mdpi.com/2073-8994/14/2/313

29. “Generating Soft Topologies via Soft Set Operators”
by A. A. Azzam, Zanyar A. Ameen, Tareq M. Al-shami and Mohammed E. El-Shafei
Symmetry 2022, 14(5), 914; https://doi.org/10.3390/sym14050914
Available online: https://www.mdpi.com/2073-8994/14/5/914

30. “Sustainable and Robust Home Healthcare Logistics: A Response to the COVID-19 Pandemic”
by Amir M. Fathollahi-Fard, Abbas Ahmadi and Behrooz Karimi
Symmetry 2022, 14(2), 193; https://doi.org/10.3390/sym14020193
Available online: https://www.mdpi.com/2073-8994/14/2/193

31.“Electromagnetic Flow of SWCNT/MWCNT Suspensions in Two Immiscible Water- and Engine-Oil-Based Newtonian Fluids through Porous Media”
by Ahmad Zeeshan, Nasir Shehzad, Muhammad Atif, Rahmat Ellahi and Sadiq M. Sait
Symmetry 2022, 14(2), 406; https://doi.org/10.3390/sym14020406
Available online: https://www.mdpi.com/2073-8994/14/2/406

32. “Multivalent Prestarlike Functions with Respect to Symmetric Points”
by Daniel Breaz, Kadhavoor R. Karthikeyan and Alagiriswamy Senguttuvan
Symmetry 2022, 14(1), 20; https://doi.org/10.3390/sym14010020
Available online: https://www.mdpi.com/2073-8994/14/1/20

33. “Fast Computation of Highly Oscillatory ODE Problems: Applications in High-Frequency Communication Circuits”
by Sakhi Zaman, Latif Ullah Khan, Irshad Hussain and Lucian Mihet-Popa
Symmetry 2022, 14(1), 115; https://doi.org/10.3390/sym14010115
Available online: https://www.mdpi.com/2073-8994/14/1/115

34. “Guidance Image-Based Enhanced Matched Filter with Modified Thresholding for Blood Vessel Extraction”
by Sonali Dash, Sahil Verma, Kavita, Savitri Bevinakoppa, Marcin Wozniak, Jana Shafi and Muhammad Fazal Ijaz
Symmetry 2022, 14(2), 194; https://doi.org/10.3390/sym14020194
Available online: https://www.mdpi.com/2073-8994/14/2/194

35. “Inferences for Alpha Power Exponential Distribution Using Adaptive Progressively Type-II Hybrid Censored Data with Applications”
by Refah Alotaibi, Ahmed Elshahhat, Hoda Rezk and Mazen Nassar
Symmetry 2022, 14(4), 651;https://doi.org/10.3390/sym14040651
Available online: https://www.mdpi.com/2073-8994/14/4/651

36. “Third-Order Differential Subordination Results for Analytic Functions Associated with a Certain Differential Operator”
by Amal Mohammed Darweesh, Waggas Galib Atshan, Ali Hussein Battor and Alina Alb Lupaş
Symmetry 2022, 14(1), 99; https://doi.org/10.3390/sym14010099
Available online: https://www.mdpi.com/2073-8994/14/1/99

37. “Optimal Plan of Multi-Stress–Strength Reliability Bayesian and Non-Bayesian Methods for the Alpha Power Exponential Model Using Progressive First Failure”
by Ehab M. Almetwally, Refah Alotaibi, Aned Al Mutairi, Chanseok Park and Hoda Rezk
Symmetry 2022, 14(7), 1306; https://doi.org/10.3390/sym14071306
Available online: https://www.mdpi.com/2073-8994/14/7/1306

38. “A New Class of Bertrand Curves in Euclidean 4-Space”
by Yanlin Li, Ali Uçum, Kazım İlarslan and Çetin Camcı
Symmetry 2022, 14(6), 1191; https://doi.org/10.3390/sym14061191
Available online: https://www.mdpi.com/2073-8994/14/6/1191

39. “Analytical Investigation of Fractional-Order Korteweg–De-Vries-Type Equations under Atangana–Baleanu–Caputo Operator: Modeling Nonlinear Waves in a Plasma and Fluid”
by Nehad Ali Shah, Haifa A. Alyousef, Samir A. El-Tantawy, Rasool Shah and Jae Dong Chung
Symmetry 2022, 14(4), 739; https://doi.org/10.3390/sym14040739
Available online: https://www.mdpi.com/2073-8994/14/4/739

40. “Fractional Calculus for Convex Functions in Interval-Valued Settings and Inequalities”
by Muhammad Bilal Khan, Hatim Ghazi Zaini, Savin Treanțǎ, Gustavo Santos-García, Jorge E. Macías-Díaz and Mohamed S. Soliman
Symmetry 2022, 14(2), 341; https://doi.org/10.3390/sym14020341
Available online: https://www.mdpi.com/2073-8994/14/2/341

41. “Impact of Brownian Motion on the Analytical Solutions of the Space-Fractional Stochastic Approximate Long Water Wave Equation”
by Farah M. Al-Askar, Wael W. Mohammed and Mohammad Alshammari
Symmetry 2022, 14(4), 740; https://doi.org/10.3390/sym14040740
Available online: https://www.mdpi.com/2073-8994/14/4/740

42. “Extended Approach to the Asymptotic Behavior and Symmetric Solutions of Advanced Differential Equations”
by Omar Bazighifan, Ali Hasan Ali, Fatemah Mofarreh and Youssef N. Raffoul
Symmetry 2022, 14(4), 686; https://doi.org/10.3390/sym14040686
Available online: https://www.mdpi.com/2073-8994/14/4/686

43. “Exploiting the Pascal Distribution Series and Gegenbauer Polynomials to Construct and Study a New Subclass of Analytic Bi-Univalent Functions”
by Ala Amourah, Basem Aref Frasin, Morad Ahmad and Feras Yousef
Symmetry 2022, 14(1), 147; https://doi.org/10.3390/sym14010147
Available online: https://www.mdpi.com/2073-8994/14/1/147