@article{MM2_1996__89_3_156168,
     author = {S. Berhanu and A. Meziani},
     title = {On {Rotaionally} invariant vector fields in the plane.},
     journal = {Manuscripta mathematica},
     pages = {355--372},
     publisher = {mathdoc},
     volume = {89},
     number = {3},
     year = {1996},
     zbl = {0858.35021},
     url = {http://geodesic.mathdoc.fr/item/MM2_1996__89_3_156168/}
}