@article{IVM_1989_2_a4,
     author = {A. A. Konyushkov},
     title = {Fourier coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {25--28},
     publisher = {mathdoc},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1989_2_a4/}
}