@book{ivanova1999,
  address = {Izhevsk},
  editor  = {Ivanova, M. G.},
  key     = {Ivanova (1999)},
  title   = {Finno-ugry Povolzh'ja i Priural'jav srednie veka (Finno-Ugric Peoples of the Volga and Ural Region in the Middle Ages)},
  year    = {1999}
}