A note on the semi-inverse approach to oscillation theory for ordinary second-order linear differential equations
Asymptotic behavior of non-linear differential equations via non-standard analysis. Part III. Boundedness and monotone behavior of the equation (a(t)φ(x)x')' + c(t)f(x) = q(t)
Review of the Kantorovič variational method
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Local analysis of nonstandard functions of pre-distributional type
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