Ginting, M.H.S., et al. “Unsaturated Polyester Composite Filled Clam Shells (Anadara granosa): Effect of Tensile Strength, Elongation Break and Water Absorption”. Asian Journal of Chemistry, vol. 31, no. 7, June 2019, pp. 1473-5, doi:10.14233/ajchem.2019.21775.