@book{Unbegaun-1957,
  address    = {Oxford},
  author     = {Unbegaun, B. O.},
  publisher  = {University Press},
  title      = {Russian Grammar},
  year       = {1957},
  iso_code   = {rus},
  olac_field = {phonetics; phonology; general_linguistics; typology},
  wals_code  = {rus}
}