Kyoichi Okamoto, Osamu Saijo, Susumu Kuwashima, Shigetoshi Kai, Seiji Kimura, Yasuhiro Sugimori; Wave measurements on the North Pacific Ocean in summer, Proceedings of IEEE OCEANS'91 Conference, pp. 950 - 955, October 1991.
Osamu Saijo; Application Of Hyperboloidal Bodies Of One Sheet To Offshore Structures, Proceedings of MTS/IEEE OCEANS'89 Conference, p. 1714, September 1989.