Velev , Valentin. 2023. “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 (1):223-28. https://doi.org/10.46687/jsar.v4i1.101.