@article{10_4064_ap_57_1_71_82,
     author = {S. Stan\v{e}k},
     title = {Nonnegative solutions of a class of second order nonlinear differential equations},
     journal = {Annales Polonici Mathematici},
     pages = {71--82},
     publisher = {mathdoc},
     volume = {57},
     number = {1},
     year = {1992},
     doi = {10.4064/ap-57-1-71-82},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-57-1-71-82/}
}