@article{AIHPA_1980__32_1_21_0,
     author = {Hein, S. and Roepstorff, G.},
     title = {Vortices in infinite free {Bose} systems},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {21--31},
     publisher = {Gauthier-Villars},
     volume = {32},
     number = {1},
     year = {1980},
     mrnumber = {574811},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1980__32_1_21_0/}
}