Piskun, 1974a
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Piskun, L.V., 1974a: Veryhachium iz Ordovika i Silura Brestskoy Vpadiny. In: Mikrofitofossilii Proterozoya i Rannego Paleozoya SSSR, p.15-20, pl.1-9; Akademiya Nauk SSSR, Leningrad, Russia.
