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@article{MOMA_1964__68_177237, author = {C.M. Petty and G. Leitmann}, title = {A {Boundedness} {Theorem} for a {Nonlinear,} {Nonautonomous} {System.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {46--51}, publisher = {mathdoc}, volume = {68}, year = {1964}, zbl = {0122.09305}, url = {http://geodesic.mathdoc.fr/item/MOMA_1964__68_177237/} }
C.M. Petty; G. Leitmann. A Boundedness Theorem for a Nonlinear, Nonautonomous System.. Monatshefte für Mathematik, Tome 68 (1964), pp. 46-51. http://geodesic.mathdoc.fr/item/MOMA_1964__68_177237/