Mineralogi︠i︡a rudonosnykh territoriĭ Evropeĭskogo severo-vostoka SSSR - ︠I︡Ushkin, Nikolaĭ Pavlovich; Makeev, A. B. (Aleksandr Borisovich) (Trudy Instituta geologii (Syktyvkar, R.S.F.S.R.), 1987)