@article{10_4064_aa_29_1_1_48,
     author = {Paul Ponomarev},
     title = {Arithmetic of quaternary quadratic forms},
     journal = {Acta Arithmetica},
     pages = {1--48},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1976},
     doi = {10.4064/aa-29-1-1-48},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-29-1-1-48/}
}