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@article{MOMA_1968__72_177414, author = {Paul Waltman and R.C. Grimmer}, title = {A {Comparison} {Theorem} for a {Class} of {Nonlinear} {Differential} {Inequalities.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {133--136}, publisher = {mathdoc}, volume = {72}, year = {1968}, zbl = {0185.17603}, url = {http://geodesic.mathdoc.fr/item/MOMA_1968__72_177414/} }
Paul Waltman; R.C. Grimmer. A Comparison Theorem for a Class of Nonlinear Differential Inequalities.. Monatshefte für Mathematik, Tome 72 (1968), pp. 133-136. http://geodesic.mathdoc.fr/item/MOMA_1968__72_177414/