@article{10_4064_aa_19_4_321_325,
     author = {John Hunsucker},
     title = {Primitive representation of a binary quadratic form as a sum of four squares},
     journal = {Acta Arithmetica},
     pages = {321--325},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1971},
     doi = {10.4064/aa-19-4-321-325},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-19-4-321-325/}
}