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Author - title
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Year
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| details | Nd | Nd | Evitt,W.R. A discussion and proposals concerning fossil dinoflagellates, Hystrichospheres, and acritarchs. II. | 1963 | |
| details | Nd | Nd | Sarjeant,W.A.S. The Hystrichospheres. A review and discussion. | 1961 | |
| original | Early Ordovician | USSR(Pre-Baltic) | Timofeev,B.V. Ancient flora of the Prebaltic Region and its stratigraphic significance | 1959 |