N. Selamat, M. M.Ansari, Z. Yahya, and R. E.Naicker, “Mechanical Properties of Polypropylene (PP) – Montmorillonite (MMT) Nanocomposites for Pre-Fabricated Vertical Drain (PVD) Application”, IJET, vol. 7, no. 4.35, pp. 689–692, Nov. 2018, doi: 10.14419/ijet.v7i4.35.23090.