On solutions of some fractional -point boundary value problems at resonance.
Existence of solutions for some third-order boundary-value problems.
Existence and multiplicity of positive solutions existence and multiplicity of positive solutions time scales.
Positive solutions for boundary value problem of nonlinear fractional differential equation.
Positive solutions of fourth-order boundary value problem with variable parameters.
Existence of positive solutions for singular fractional differential equations.
The method of lower and upper solutions for some fourth-order equations.
Positive periodic solutions of impulsive delay differential equations with sign-changing coefficient.
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