A.  Kungsuwan, Nagashima, Y., Noguchi, T., Shida, Y., Suvapeepan, S., Suwansakornkul, P., and Hashimoto, K., ?Tetrodotoxin in the horseshoe crab Carcinoscorpius rotundicauda inhabiting Thailand?, Nippon Suisan GakkaishiNippon Suisan Gakkaishi, vol. 53, pp. 261-266, 1987.

N.  Fusetani, Endo, H., Hashimoto, K., and Takahashi, K., ?Occurrence of potent toxins in the horseshoe crab Carcinoscorpius rotundicauda?, ToxiconToxicon, vol. 20, pp. 662-664, 1982.