@article{AM2_1985__29_137089,
     author = {Bhagat Singh},
     title = {On existence of nonoscillatory solutions in forced nonlinear differential equations.},
     journal = {Aequationes mathematicae},
     pages = {150--161},
     publisher = {mathdoc},
     volume = {29},
     year = {1985},
     zbl = {0587.34051},
     url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137089/}
}