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In: Mesezhnikov, M.S. (editor-in chief), Azbel, A.Y. et al. (editors), Novye rody i vidy drevnykh rastenii i bespozvonochnykh SSSR, p.5-7; Vsesoyuznyi Neftyanoi Nautchno-Issledovatelskii Geologorazvedochnyi Institut, Leningrad (VNIGRI), Nedra, Leningradskoe Otdelenie, Leningrad, Russia.