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Douvilleiceratid ammonites from the lower to middle Albian (Lower Cretaceous) Yezo Group of Hokkaido, Japan, and a revision of
the genus Douvilleiceras; Futakami, M; Haggart, J W. Cretaceous Research vol. 88, 2017 p. 273-292,
https://doi.org/10.1016/j.cretres.2017.04.011 (ESS Cont.# 20160319)