Dagis A.A. (1968) Toarcian ammonites (Dactylioceratidae) of the north of Siberia // Trans. Inst. Geol. Geophys. Sib. Branch Ac. Sci. USSR. Issue 40. 108 p. [in Russian] pdf: http://rogov.zwz.ru/Dagis,1968_Siberian_Dactylioceratidae.pdf
This book provides fullmost review of the Toarcian dactylioceratids from Sibera and North-East of Russia.
