Velev , Valentin. “THERMO - MECHANICAL MODIFICATION OF AMORPHOUS POLYESTER FIBRES: I. DEFORMATION BEHAVIOUR: THERMO - MECHANICAL MODIFICATION OF AMORPHOUS POLYESTER FIBRES: I. DEFORMATION BEHAVIOUR”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH 4, no. 1 (March 8, 2023): 223–228. Accessed November 24, 2024. https://jsar.ftn.shu.bg/ojs-3.3.0-7/index.php/jsar/article/view/101.