Ray, SK, RH Bhuiyan, MS Islam, MJ Abedin, PK Nandy, Z Islam, MR Hasan, and HP Nur. “Modification of 80-100 Penetration Grade Bitumen”. Bangladesh Journal of Scientific and Industrial Research 54, no. 4 (December 30, 2019): 307–320. Accessed August 17, 2024. https://banglajol.info/index.php/BJSIR/article/view/44565.