**Grzegorz Swit ´**

Faculty of Civil Engineering and Architecture, Kielce University of Technology, Aleja Tysi ˛aclecia Pa ´nstwa Polskiego 7, 25-314 Kielce, Poland; gswiter@gmail.com; Tel.: +48-881-290-171

Received: 2 July 2018; Accepted: 2 August 2018; Published: 3 August 2018
