Thu Thuy, Nguyen, Duong Ai Phuong, Nguyen Van Den, Mamedov R. K., and Zolatarov V. M. 2000. “STUDYING QUALITY OF THIN FILM OF POLYPYROMELLITIMIDE, PAPER BY METHOD ATTENUATED TOTAL REFLECTION (ATR) WITH THE HELP OF OPTICAL CONTACT”. VNUHCM Journal of Science and Technology Development 3 (9&10), 40-46. https://doi.org/https://doi.org/10.32508/stdj.v3i9&10.3595.