For citations:

Opaev A.S. How long are the vocal sequences a passerine bird can memorize? Common song sequences of Radde’s warbler males (Phylloscopus schwarzi) (Passeriformes, Aves). Povolzhskiy Journal of Ecology. 2022;(3):361-369. (In Russ.) https://doi.org/10.35885/1684-7318-2022-3-361-369