Archaeology of the Eurasian steppes. Issue 21
Semykin Yu.A. Ferrous metallurgy and blacksmithing of Volga Bolgaria in the 8th - early 13th centuries. Series “Archaeology of the Eurasian steppes”. Issue 21 - Kazan: “Otechestvo” Publ., 2015, 168 p., Illustrated, inserts: pp. 169-228.