Authors Year Title
Nikolaeva, Akhmetshina & Konovalova 2009 The Carboniferous carbonates of the Dombar Hills (western Kazakhstan) and the problem of the Viséan-Serpukhovian boundary. [S.V.Nikolaeva, L.Z.Akhmetshina, V.A.Konovalova, V.F.Korobkov & G.F.Zainakaeva]
Palaeoworld, 18: 80-93, 9 fig.
Nikolaeva, Kulagina & Pazukhin 2009 Paleontology and Microfacies of the Serpukhovian in the Verkhnyaya Kardailovka Section, South Urals, Russia: potential candidate for the GSSP for the Viséan-Serpukhovian boundary.(S.V.Nikolaeva, et al., for full authors see Note.
Newsletters on Stratigrahy, 43/2: 165-193, 8 fig.,3 pl., Berlin, Stuttgart.
Popov 1975 Ammonoidea (Ammonoidei). In: Paleontologicheskii Atlas kamennougol'nykh otlozhenii Urala. [In Russian].
Trudy VNIGRI 383: 111-130, pls.35-44, Leningrad (Nedra).
Ruan & Zhou 1987 Carboniferous cephalopods in Ningxia Hui Autonomous Region. [In Chinese, with Engl. summary].
Namurian Strata and Fossils of Ningxia, China: 55-177, 78 text-figs., 15 pls., Nanjing.
Ruzhencev & Bogoslovskaya 1971a Namiurskii etap v evoliutsii ammonodei. Rannenamiurskie ammonoidei.
Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 133: 1-382, fig.1-89, pl.1-40; Moskva.