含脉冲的二阶次线性微分方程两点边值问题正解存在的必要条件
함맥충적이계차선성미분방정량점변치문제정해존재적필요조건
Necessary Conditions for the Existence of Positive Solution of Singular Two-point Boundary Value Problem for Second-order Impulsive Sublinear Differential Equation
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