@article{DAN_1981_261_3_a0,
     author = {M. K. Akbarov},
     title = {On mean square {Fourier} coefficients of cusp forms over arithmetic progressions},
     journal = {Doklady Akademii Nauk},
     pages = {521--523},
     publisher = {mathdoc},
     volume = {261},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_3_a0/}
}