@article{AA_2004_16_1_a7,
     author = {I. M. Sigal and F. Ting},
     title = {Pinning of magnetic vortices by an external potential},
     journal = {Algebra i analiz},
     pages = {239--268},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_2004_16_1_a7/}
}