@article{10_4064_aa_14_4_357_369,
     author = {John Hardy},
     title = {Sums of two squares in a quadratic ring},
     journal = {Acta Arithmetica},
     pages = {357--369},
     publisher = {mathdoc},
     volume = {14},
     number = {4},
     year = {1968},
     doi = {10.4064/aa-14-4-357-369},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-14-4-357-369/}
}