Ray, S., Bhuiyan, R., Islam, M., Abedin, M., Nandy, P., Islam, Z., Hasan, M. and Nur, H. 2019. Modification of 80-100 penetration grade bitumen. Bangladesh Journal of Scientific and Industrial Research. 54, 4 (Dec. 2019), 307–320. DOI:https://doi.org/10.3329/bjsir.v54i4.44565.