@article{IM2_1969_3_6_a8,
     author = {I. T. Kiguradze},
     title = {On monotone solutions of nonlinear ordinary differential equations of order $n$.},
     journal = {Izvestiya. Mathematics },
     pages = {1293--1317},
     publisher = {mathdoc},
     volume = {3},
     number = {6},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1969_3_6_a8/}
}