Verkhnekamskiĭ TPK : problemy formirovani︠i︡a i razviti︠i︡a : sbornik nauchnykh trudov - Sergeev, Mikhail Aleksandrovich; Stepanov, M. N. (Mikhail Nikolaevich); Chazov, B. A. (Akademi︠i︡a nauk SSSR, Uralʹskiĭ nauch. ︠t︡sentr, 1987)