Process Planning Review for Mobile Phone Remanufacturing in Indonesia Yopi Yusuf Tanoto, Shu-San Gan, Didik Wahjudi, Niko Adrisenna Pontjonoto and Michael Suryajaya E3S Web Conf., 130 (2019) 01039 Published online: 15 November 2019 DOI: 10.1051/e3sconf/201913001039