1. Volkov , SS . 2001 .Welding and bonding of polymer materials, a textbook for higher technical schools, 376 Moscow : Khimiya .
2. Donskoi , AV , Keller , DC and Kratysh , GS . 1982 .Ultrasonic electrical engineering systems, 2nd ed. , 208 Leningrad : Energoizdat .
3. Komarov , GV . 1979 .Methods of joining plastic components, 288 Moscow : Khimiya .
4. Gul' , VE and Akutin , MS . 1985 .The fundamentals of processing of plastics, 399 Moscow : Khimiya .
5. Gul' , VE and Kuleznev , VN . 1979 .Structure and mechanical properties of polymers, 352 Moscow : Vysshaya shkola .