中国科学院数学与系统科学研究院期刊网
DISTRIBUTION OF ZEROS OF SOLUTIONS OF FIRST ORDER NEUTRAL DIFFERENTIAL EQUATIONS WITH POSITIVE AND NEGATIVE COEFFICIENTS
Wen Rui SHAN, Wei Gao GE , Zhi Lei NIU
Acta Mathematicae Applicatae Sinica . 2004, (1): 12 -26 .  DOI: 10.12387/C2004002