@article{10_4064_ap_38_2_101_108,
     author = {V. Komkov},
     title = {Asymptotic behavior of non-linear differential equations via non-standard analysis. {Part} {III.} {Boundedness} and monotone behavior of the equation (a(t)\ensuremath{\varphi}(x)x')' + c(t)f(x) = q(t)},
     journal = {Annales Polonici Mathematici},
     pages = {101--108},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1980},
     doi = {10.4064/ap-38-2-101-108},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-38-2-101-108/}
}