Raheem, Akeem Ayinde, and Emmanuel Olatunde Ibiwoye. 2018. “A Study of Neem Seed Husk Ash As Partial Replacement for Cement in Concrete”. International Journal of Sustainable Construction Engineering and Technology 9 (2): 55-65. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/1534.