@article{VMUMM_2001_1_a13,
     author = {S. N. Preobrazhenskii},
     title = {On the least quadratic nonresidue in an arithmetic sequence},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {54--56},
     publisher = {mathdoc},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2001_1_a13/}
}