@article{PMF_1904_15_1_a8,
     author = {Lerch, M.},
     title = {O liczbie klas form kwadratowych dw\'ojkowych o wyr\'o\.zniku zasadniczym dodatnim},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {91--113},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1904},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/PMF_1904_15_1_a8/}
}