A note on a generalization of the Sturm-Picone theorem
Continuability and estimates of solutions of (a(t)ψ(x)x')' + c(t)f(x) = 0
Asymptotic behavior of non-linear inhomogeneous differential equations via non-standard analysis. Part II. Some applications to higher order equations
Asymptotic behavior of non-linear inhomogeneous equations via non-standard analysis. Part I. Second order equations
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