@book{levinandpotapov1956,
  address = {Moscow-Leningrad},
  editor  = {Levin, M. G. and Potapov, L. P.},
  key     = {Levin and Potapov (1956)},
  title   = {Narody Sibiri (Siberian Peoples)},
  year    = {1956}
}