@article{CHEB_2021_22_1_a27,
     author = {S. S. Demidov},
     title = {At the sharp turns of the 20th century {European} history},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {403--412},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2021_22_1_a27/}
}