Mulyono, A. B. ., and E. H. . Purwanto. “Characteristics of Quality Requirements for LPG Rubber Hose and LPG Thermoplastic Elastomer Hose in Indonesia”. Proceeding International Conference on Religion, Science and Education, vol. 1, Feb. 2022, pp. 645-9, http://sunankalijaga.org/prosiding/index.php/icrse/article/view/849.