@article{CLTM_1997_1997_1_a2,
     author = {Niklash, Gerhard},
     title = {Recuento de unidades excepcionales.},
     journal = {Collectanea mathematica},
     pages = {195-207},
     year = {1997},
     volume = {48},
     number = {1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1997_1997_1_a2/}
}