@article{GRSME_2008_2008_1_a23,
     author = {Aguirre, Juli\'an and  Peral, Juan Carlos},
     title = {Sobre el n\'umero de clases y las ra{\'\i}ces primitivas.},
     journal = {La Gaceta de la Real Sociedad Matem\'atica Espa\~nola},
     pages = {705-720},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {2008},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GRSME_2008_2008_1_a23/}
}