@article{10_4064_aa_39_1_95_104,
     author = {Paul Ponomarev},
     title = {Class number formulas for quaternary quadratic forms},
     journal = {Acta Arithmetica},
     pages = {95--104},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {1981},
     doi = {10.4064/aa-39-1-95-104},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-39-1-95-104/}
}