For citations:

Ermishina K.B., Sharonov V.I. Sergey Efron to Lev Karsavin: “But your place is empty!”. Letters of the “left” Eurasians to L.P. Karsavin as a chronicle of the Klamarsky split. RSUH/RGGU BULLETIN. Series Philosophy. Social Studies. Art Studies. 2023;(2):10-45. (In Russ.) https://doi.org/10.28995/2073-6401-2023-2-10-45