@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/}
}