KANG Shugui,CHEN Huiqing,YUE Yaqing,GAO Ying
(1.School of Mathematics and Computer Sciences,Shanxi Datong University,Datong,Shanxi,037009,China; 2.Department of Mathematics,Shanxi Normal University,Linfen,Shanxi,041000,China)
上海師范大學(xué)學(xué)報(bào)·自然科學(xué)版2016年3期