@article{GDZPPN002237628, title = {On Rotaionally invariant vector fields in the plane.}, journal = {Manuscripta mathematica}, volume = {91}, year = {1996}, pages = {355-372}, zbl = {0858.35021}, url = {http://dml.mathdoc.fr/item/GDZPPN002237628} }
Berhanu, S.; Meziani, A. On Rotaionally invariant vector fields in the plane.. Manuscripta mathematica, Tome 91 (1996) pp. 355-372. http://gdmltest.u-ga.fr/item/GDZPPN002237628/