@article{RM_1975_30_5_a17,
     author = {D. A. Mit'kin},
     title = {Lower bounds of sums of {Legendre} symbols and lower bounds of trigonometric sums},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1975_30_5_a17/}
}