Development of Total Hip Joint Replacement Prostheses Made by Local Material: An IntroductionTresna Priyana Soemardi, Agri Suwandi, Cholid Badri, Anwar Soefi Ibrahim, Sastra Kusuma Wijaya and Januar Parlaungan SiregarE3S Web Conf., 130 (2019) 01032DOI: https://doi.org/10.1051/e3sconf/201913001032