中国科学院数学与系统科学研究院期刊网
The Positive Solution to a Class of Second-order Semipositone Eigenvalue Problems
LUAN Shixia, SUN Qinfu
Acta Mathematicae Applicatae Sinica . 2011, (1): 10 -16 .  DOI: 10.12387/C2011002