Sanda, H. A., M. A. Abubakar, A. M. Abubakar, M. . Bashir, and M. . Stojchevski. “Utilization of Neem Seed Oil As Surfactant in the Production of Flexible and Rigid Polyurethane Foam”. Emerging Technologies and Engineering Journal, vol. 1, no. 2, Oct. 2024, pp. 40-52, doi:10.53898/etej2024123.