@article{MZM_1970_8_6_a12,
     author = {P. D. Varbanets},
     title = {Lattice points in a circle whose distances from the center arein an arithmetic progression},
     journal = {Matemati\v{c}eskie zametki},
     pages = {787--798},
     year = {1970},
     volume = {8},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_6_a12/}
}