%0 Journal Article %T Conditions for the Separability of Objects in Two-Dimensional Velocity Fields %J Canadian mathematical bulletin %D 1992 %P 484-491 %V 35 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-063-1/ %R 10.4153/CMB-1992-063-1 %F 10_4153_CMB_1992_063_1