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@article{MAN_1957__133_160547, author = {R.M. Redheffer}, title = {The {Riccati} {Equation:} {Initial} {Values} and {Inequalities.}}, journal = {Mathematische Annalen}, pages = {235--250}, publisher = {mathdoc}, volume = {133}, year = {1957}, zbl = {0102.07201}, url = {http://geodesic.mathdoc.fr/item/MAN_1957__133_160547/} }
R.M. Redheffer. The Riccati Equation: Initial Values and Inequalities.. Mathematische Annalen, Tome 133 (1957), pp. 235-250. http://geodesic.mathdoc.fr/item/MAN_1957__133_160547/