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@article{MM2_1984__49_155039, author = {Carmen Chicone and Paul Ehrlich}, title = {Gradient-Like and {Integrable} {Vector} {Fields} on {IR2.}}, journal = {Manuscripta mathematica}, pages = {141--164}, publisher = {mathdoc}, volume = {49}, year = {1984}, zbl = {0564.58016}, url = {http://geodesic.mathdoc.fr/item/MM2_1984__49_155039/} }
Carmen Chicone; Paul Ehrlich. Gradient-Like and Integrable Vector Fields on IR2.. Manuscripta mathematica, Tome 49 (1984), pp. 141-164. http://geodesic.mathdoc.fr/item/MM2_1984__49_155039/