中国科学院数学与系统科学研究院期刊网
FORMULAS OF SINGULAR POINT QUANTITIES AND THE FIRST 10 SADDLE QUANTITIES FOR A CLASS OF CUBIC SYSTEM
Yi Rong LIU, Hai Bo CHEN
Acta Mathematicae Applicatae Sinica . 2002, (2): 295 -302 .  DOI: 10.12387/C2002037