Maslov, 1956
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Maslov, V.P., 1956: 3. Hystrichosphaera-spory, tsisty ili rastitelnye organizmy? In: Iskopaemye Izvestkovye Vodorosli SSSR; Akademiya Nauk SSSR, Institut Geologicheskikh Nauk, Moscow, Trudy, no.160, p.258-264, pl.86.