Institution: | Department of Mathematics, Sichuan University, Chengdu, Sichuan 610064, People's Republic of China B. S. Lee ; Department of Mathematics, Kyungsung University, Pusan 608-736, Korea ; Department of Mathematics, Gyeongsang National University, Chinju 660-701, Korea Y. Q. Chen ; Department of Mathematics, Sichuan University, Chengdu, Sichuan 610064, People's Republic of China S. M. Kang ; Department of Mathematics, Gyeongsang National University, Chinju 660-701, Korea J. S. Jung ; Department of Mathematics, Dong-A University, Pusan 604-714, Korea |