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Okamura, Beth; O'Deaa, Aaron (October 2000). "Intracolony variation in zooid size in cheilostome bryozoans as a new technique for investigating palaeoseasonality". Palaeogeography, Palaeoclimatology, Palaeoecology. 162 (3–4): 319–332. Bibcode:2000PPP...162..319O. doi:10.1016/S0031-0182(00)00136-X.
Okamura, Beth; Bishop, John D. D. (August 1988). "Zooid size in cheilostome bryozoans as an indicator of relative palaeotemperature". Palaeogeography, Palaeoclimatology, Palaeoecology. 66 (3–4): 145–152. Bibcode:1988PPP....66..145O. doi:10.1016/0031-0182(88)90197-6.
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Okamura, Beth; O'Deaa, Aaron (October 2000). "Intracolony variation in zooid size in cheilostome bryozoans as a new technique for investigating palaeoseasonality". Palaeogeography, Palaeoclimatology, Palaeoecology. 162 (3–4): 319–332. Bibcode:2000PPP...162..319O. doi:10.1016/S0031-0182(00)00136-X.
Okamura, Beth; Bishop, John D. D. (August 1988). "Zooid size in cheilostome bryozoans as an indicator of relative palaeotemperature". Palaeogeography, Palaeoclimatology, Palaeoecology. 66 (3–4): 145–152. Bibcode:1988PPP....66..145O. doi:10.1016/0031-0182(88)90197-6.
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Prothero, Donald R. (2013). Bringing fossils to life : an introduction to paleobiology (Third ed.). New York: Columbia University Press. pp. 339–340. ISBN978-0-231-53690-5. OCLC863683957.