Basiouny, M. E., Eisa, M. S., Abdallah, A. M., & Algahny, A. A. A. (2019). The Effect of Diffraction in the Degree of Bitumen Penetration on Asphalt Mixture Used for Surface Layer. Journal of Scientific Research and Reports, 25(4), 1-10. https://doi.org/10.9734/jsrr/2019/v25i430189