@article{EXMA_2004__13_4_53858,
     author = {Aicardi, Francesca},
     title = {On the number of perfect binary quadratic forms.},
     journal = {Experimental mathematics},
     pages = {451--457},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {2004},
     zbl = {1133.11310},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_2004__13_4_53858/}
}