@article{MZM_1988_43_2_a4,
     author = {\`E. M. Galeev},
     title = {Orders of the orthoprojection widths of classes of periodic functions of one and of several variables},
     journal = {Matemati\v{c}eskie zametki},
     pages = {197--211},
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_43_2_a4/}
}