Gregory Borovka, Scythian Art; M.I.Rostovtzeff, The Animal Style in South Russia and China (Princeton, N.J.: Princeton University Press, 1929); Ludwig Bachhofer, A Short History of Chinese Art, p.46; Robert Heine-Geldern, «Das Tocharerproblem und die pontische Wanderung», Saeculum, II (1951), 225-55; Karl Jettmar, «The Altai before the Turks», 148-56.
