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Ozawa, T.; Watanabe, K.; Kobayashi, F. (1992). Morphologic evolution in some schwagerinid and schubertellid lineages and the definition of the Carboniferous-Permian boundary. In: Takayanagi, Y.; Saito, T. (Editors), Studies in Benthic Foraminifera. Tokai University Press. 389-402.