中国科学院数学与系统科学研究院期刊网
MULTIPLE POSITIVE SOLUTIONS FOR BOUNDARY VALUE PROBLEM OF SECOND ORDER SINGULAR FUNCTIONAL DIFFERENTIAL EQUATIONS
Pei Xuan WEN, Da Qing JIANG
Acta Mathematicae Applicatae Sinica . 2000, (1): 99 -107 .  DOI: 10.12387/C2000026