@article{VMUMM_1997_3_a15,
     author = {A. Yu. Lvov},
     title = {On integer quaternions with norm equal to the power of a prime number},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {60--62},
     year = {1997},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1997_3_a15/}
}