1. Head, Dept. of Thin-Walled Structures, Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, Prosecká 76, 190 00 Prague 9, Czech Republic (corresponding author).
2. Deputy Director, Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, Prosecká 76, 190 00 Prague 9, Czech Republic.
3. Senior Manager, NET4GAS, s.r.o., Na Hřebenech II 1718/8, 140 00 Prague 4, Czech Republic.