Chuang, C. L.C. L.ChuangLin, J.S.J.S.Lin2010-05-222018-06-282010-05-222018-06-281992http://ntur.lib.ntu.edu.tw//handle/246246/184050application/pdf314152 bytesapplication/pdfen-USRings with nil and power central K -th commutatorsjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/184050/1/25.pdf