Salar: A Study in Inner Asian Language Contact Processes, Arienne M. Dwyer, pp. 29, Otto Harrassowitz Verlag, 2007, ISBN 978-3-447-04091-4, ... Early on, the so-called Oghur or Bulghar branch in the west split off from Common Turkic; Chuvash, spoken in the mid- Volga region, is the only surviving Oghur member ...