@article{MZM_1975_18_3_a10,
     author = {G. I. Perel'muter},
     title = {Estimate of a~multiple sum involving the {Legendre} symbol},
     journal = {Matemati\v{c}eskie zametki},
     pages = {421--427},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_3_a10/}
}