中国科学院数学与系统科学研究院期刊网
Left-Definite Boundary Conditions of Regular Fourth-Order Differential Operators
GAO Yunlan, PENG Tao, SUN Jiong
Acta Mathematicae Applicatae Sinica . 2010, (1): 867 -877 .  DOI: 10.12387/C2010029