1. S. V. Yuzepchuk, Flora of the USSR (Moscow-Leningrad, 1941), Vol. X [in Russian].
2. S. Ya. Sokolov and O. A. Svyazeva, Geography of the USSR Arboreal Plants (Moscow-Leningrad, 1965), Vol. 4 [in Russian].
3. A. A. Yunatov, The Main Features of the Vegetation Cover of the Mongolian People’s Republic (Moscow-Leningrad, 1950) [in Russian].
4. A. V. Kuminova, Vegetation Cover of Altai (Novosibirsk, 1960) [in Russian].
5. Vegetation Cover and Natural Forage Lands of Tuva (Novosibirsk, 1985) [in Russian].