ESHBAEVA, U., D. SAFAEVA, D. ZUFAROVA, and B. BALTABAEVA. “IR SPECTROSCOPIC ANALYSIS OF BIAXIALLY DIRECTED POLYPROPYLENE AND POLYETHYLENE POLYMER FILMS”. Scientific and Technical Journal of Namangan Institute of Engineering and Technology, vol. 8, no. 3`, Sept. 2023, pp. 110-5, http://niet.uz/index.php/nj/article/view/288.