@article{AIHPA_1999__71_4_359_0,
     author = {M\"uger, Michael},
     title = {On charged fields with group symmetry and degeneracies of {Verlinde{\textquoteright}s} matrix $S^\ast $},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {359--394},
     publisher = {Gauthier-Villars},
     volume = {71},
     number = {4},
     year = {1999},
     mrnumber = {1721563},
     zbl = {0938.81018},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1999__71_4_359_0/}
}