中国科学院数学与系统科学研究院期刊网
AMS
Positive Solutions for Second-Order m-Point Boundary Value Problems on Time Scales
Wan Tong LI, Hong Rui SUN
Acta Mathematica Sinica . 2006, (6): 1797 -1804 .  DOI: 10.1007/s10114-005-0748-5