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harvard.edu
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Repina, L.N.; Romanenko, E.V.; Fedjanina, E.S.; Pegel, T.V. (1999). "Trilobites from the Lower and Lowermost middle Cambrian of the Kiya river reference section (Kuznetsk, Alatau)". Annales de Paléontologie. 85 (1): 3–56. Bibcode:1999AnPal..85....3R. doi:10.1016/s0753-3969(99)80007-x. cited in Paleobiology Database. "Abakania". Retrieved 17 December 2021.