Liu, Chein-ShanChein-ShanLiuHong, Hong-KiHong-KiHongLiou, Der-YuanDer-YuanLiou2008-10-232018-07-092008-10-232018-07-092002http://ntur.lib.ntu.edu.tw//handle/246246/85131application/pdf498404 bytesapplication/pdfen-USTwo-Dimensional Friction Oscillator: Group Preserving Scheme and Handy Formulaejournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/85131/1/10.pdf