Rihayat, T. ., Salim, . S. ., Agusnar, H. ., Fajri, & Zaimahwati. (2015). Synthesis of polyurethane/clay nanocomposites based palm oil polyol coating. Journal of Mechanical Engineering and Sciences, 9, 1580–1586. https://doi.org/10.15282/jmes.9.2015.5.01