Takashi Danjo, and Satoru Kawasaki. “A STUDY OF THE FORMATION MECHANISM OF BEACHROCK IN OKINAWA, JAPAN: TOWARD MAKING ARTIFICIAL ROCK”. GEOMATE Journal, vol. 5, no. 9, Sept. 2013, pp. 634-9, https://geomatejournal.com/geomate/article/view/2026.