@article{MM2_1993__78_4_155817,
     author = {Italo Vecchi and Sijue Wu},
     title = {On {L1-Vorticity} for {2-D} incompressible flow.},
     journal = {Manuscripta mathematica},
     pages = {403--412},
     publisher = {mathdoc},
     volume = {78},
     number = {4},
     year = {1993},
     zbl = {0807.35115},
     url = {http://geodesic.mathdoc.fr/item/MM2_1993__78_4_155817/}
}