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Matsumoto T. (1965) A monograph of the Collignoniceratidae from Hokkaido, part I (Studies of the Cretaceous ammonites from Hokkaido and Saghalien XIV) // Memoirs of rhe Faculty of Science, Kyushu University, series D, Geology, 16 (1). Pp. 161-180, fig.1-4, pl.1-18.