Shirokogoroff 193539. Buga, quote : "The inference which can be made from these facts is that the conception of «highest being» and the term for it buga (with modifications), are very old and they are accepted by the Tungus groups who are not at present under a very strong alien influence." Широкогоров (Shirokogoroff), С.М. (S.M.) (2009–2018) [1935], "Psychomental Complex of the Tungus", www.shirokogorov.ru, vol. 2
