The Effect of Layer Variation Between Liner and Cement Mantle on Reducing Cracks of PMMA Material Hip JointsEko Saputra, J Jamari, Han Ay Lie, Iwan Budiwan Anwar, Rifky Ismail, Mohammad Tauviqirrahman and Emile van der HeideE3S Web Conf., 73 (2018) 12013DOI: https://doi.org/10.1051/e3sconf/20187312013