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)

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V. Komkov Annales Polonici Mathematici 38 (1980), 101-108 DOI: 10.4064/ap-38-2-101-108