Batuev N.A. Eight cases of double deformities in humans. (Two-headed deformities) In Russian (ask us if in doubt)/Batuev N.A. Vosem sluchaev dvoynogo urodstva u cheloveka. (Dvugolovye urody)Notes of the Imperial Academy of Sciences, Vol. XIX, # 8 St. Petersburg, 1906, 73 pp.. SKUalb447b3acee7b1815d.