P. K. Wardhani, N. Padmi T, S. Nasir, and P. K. Wardhani, “Fabrication of Thermoplastic Elastomers (TPE) by Using Emulsion Method as an Alternative Material For Vehicle Bumper Protector”, sci. technol. indones., vol. 3, no. 4, pp. 151–156, Oct. 2018.