@article{10_4064_aa101_1_6,
     author = {Gerald Kuba},
     title = {On the distribution of
squares of integral quaternions {II}},
     journal = {Acta Arithmetica},
     pages = {81--95},
     publisher = {mathdoc},
     volume = {101},
     number = {1},
     year = {2002},
     doi = {10.4064/aa101-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa101-1-6/}
}