8. Guanghui Xiang,Maoan Han Global bifurcation of limit cycles in a family of multiparameter system INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS 14 (9): 3325-3335 SEP 2004 (SCI)
9. Guanghui Xiang,Maoan Han Global bifurcation of limit cycles in a family of polynomial systems JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS 295 (2004)633-644 (SCI)
10. Guanghui Xiang; Maoan Han; Tonghua Zhang The number of limit cycles for a family of polynomial systems COMPUTERS AND MATHEMATICS WITH APPLICATIONS 49 (2005) 1669--1678. (SCI)