Dodekova, 1969
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Dodekova, L., 1969: Dinoflagellés et acritarches du Tithonique aux environs de Pleven, Bulgarie central du nord. Bulgarska Akademiya na Naukite, Izvestiya na Geologicheskiya Institut, Seriya Paleontologiya, v.18, p.13-24, pl.1-5.