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Schopf, J. William; Kudryavtsev, Anatoliy B.; Sergeev, Vladimir N. (2010). "Confocal laser scanning microscopy and Raman imagery of the late Neoproterozoic Chichkan microbiota of South Kazakhstan". Journal of Paleontology. 84 (3): 402–416. Bibcode:2010JPal...84..402S. doi:10.1666/09-134.1. S2CID130041483.
"Montenari, M. & Leppig, U. (2003): The Acritarcha: their classification morphology, ultrastructure and palaeoecological/palaeogeographical distribution". Paläontologische Zeitschrift. 77: 173–194. 2003. doi:10.1007/bf03004567. S2CID127238427.