1. Isoyake in southwestern coasts of Hokkaido;Agatsuma Y.;Hokusishidayori,1995
2. Strongylocentrotus nudus
3. Strongylocentrotus intermedius
4. Agatsuma, Y., Sakai, Y. & Matsuda, T. (1995). Manual of transplantation of the Sea Urchin seeds Strongylocentrotus intermedius. Hokkaido Central Fisheries experimental Station. Nitto Press Co. Ltd., Otaru. (in Japanese).
5. Year-to-year variation of areas of macroalgal crustose coralline algal communities interpreted from aerial photographs and SCUBA along the western coast of Shakotan Peninsula, Hokkaido, Japan;Akaike S.;Scientific Reports of Hokkaido Fisheries Experimental Station,1999