一类四阶奇异Sturm-Liouville边值问题正解存在的充分必要条件
일류사계기이Sturm-Liouville변치문제정해존재적충분필요조건
Necessary and Sufficient Condition for the Existence of Positive Solutions to a Class of Fourth-order Singular Sturm-Liouville Boundary Value Problems
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