Agatsuma, Yukio; Yamada, Hirokazu; Taniguchi, Kazuya (2006). "Distribution of the sea urchin Hemicentrotus pulcherrimus along a shallow bathymetric gradient in Onagawa Bay in northern Honshu, Japan". Journal of Shellfish Research. 25 (3): 1027–1036. doi:10.2983/0730-8000(2006)25[1027:DOTSUH]2.0.CO;2.