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        Journal: Symmetry, 2021
        Volume: 13 
                	Number: 1797 
                
        
        Article:
        Two Isospectral-Nonisospectral Super-Integrable Hierarchies and Related Invariant Solutions 
        Authors: 
       	by
                    Huanhuan Lu and Yufeng Zhang        
        Link:
        https://www.mdpi.com/2073-8994/13/10/1797
        
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