@article{JEMS_2004_6_1_a1,
     author = {Fabrice Bethuel and Giandomenico Orlandi and Didier Smets},
     title = {Vortex rings for the {Gross-Pitaevskii} equation},
     journal = {Journal of the European Mathematical Society},
     pages = {17--94},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2004},
     doi = {10.4171/jems/2},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/2/}
}