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