数学物理学报 ›› 2000, Vol. 20 ›› Issue (4): 487-492.
(华南理工大学应用数学系 广州 510641)
(惠州大学数学系 惠州 516003)
(汕头大学物理系 汕头 515063)
(Department of Applied Mathematics, South China University of Technology, Guanzhou 510641)
(Department of Mathematics, Huizhou University, Huizhou 516003)
(Department of physics, Shantou University, Shantou 515063)