Jenessa Mae B. David, Warren P. De Guzman, Gian Russel B. Nunag, Alhjey Y. Perez, Erica Joy C. Salunga, Chestmarc M. Tañamor, Ma. Lois G. Dela Cruz, and Aaron S. Malonzo. “Evaluation of Polypropylene Fibers from Shredded Face Masks As Additives in Non-Load Bearing Concrete Hollow Blocks”. International Journal of Progressive Research in Science and Engineering 4, no. 7 (July 19, 2023): 62–72. Accessed May 18, 2024. https://journal.ijprse.com/index.php/ijprse/article/view/954.