Berhanu, S, Meziani, A. (1996). On rotationally invariant vector fields in the plane
.
Manuscripta Mathematica, 89(3), 355-371. 10.1007/BF02567523
Berhanu, S, Meziani, A. (1996). On rotationally invariant vector fields in the plane
. Manuscripta Mathematica, 89(3), 355-371. 10.1007/BF02567523