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