TY - JOUR AU - S. S. Demidov TI - Once again about the <> of Moscow mathematicians in Petrograd in 1921 JO - Čebyševskij sbornik PY - 2021 SP - 263 EP - 269 VL - 22 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CHEB_2021_22_5_a17/ LA - ru ID - CHEB_2021_22_5_a17 ER -