中国科学院大学学报 ›› 2006, Vol. 23 ›› Issue (5): 581-587.DOI: 10.7523/j.issn.2095-6134.2006.5.002
张军舰
1 中国科学院数学与系统科学研究院, 北京, 100080;
2 广西师范大学数学与计算机科学学院, 桂林, 541004;
ZHANG Jun-Jian
1 Academy of Mathematics and Systems Science, CAS, Beijing,100080;
2 College of Mathematics and Computer Science, Guangxi Normal University, Guilin,541004