1. Department of Mathematics, East China Normal University, Shanghai 200241, China; 2. Chizhou Vocational and Technical College, Chizhou Anhui 247000, China
GUAN Zhi-zhong;LIU Yong-ming. On the problem of transversal selection (Chinese)[J]. Journal of East China Normal University(Natural Sc, 2009, 2009(5): 100-106.