1. M. Auezov South Kazakhstan University, Higher School of Textile and Food Engineering, Department of Technology and Design of Light Industry Products , Shymkent , Kazakhstan
2. Ege University, Faculty of Engineering, Department of Leather Engineering , , Bornova-Izmir , Turkey
3. M. Kh. Dulaty Taraz Regional University , Tole bi str. 60, 080000 Taraz , Kazakhstan
4. Jizzakh Polytechnic Institute , 4 Islam Karimov, 130100 Jizzakh , Jizzakh , Uzbekistan