1. Gravesen, H., and Sørensen, T., “Stability of Rubble Mound Breakwaters”, Proc. 24th Int. Nav. Congress, PIANC., Leningrad, 1977, p. 65–74.
2. “Stability of Rubble Mound Breakwaters II”;Gravesen,1980
3. “The Effect of Wave Grouping on On-Shore Structures”;Burcharth;Coastal Engineering,1979
4. “Stochastic Processes”;Parzen,1962
5. Bruun, P., and Günbak, A.R., “New Design Principles for Rubble Mound Structures”, Proc. Int. Coastal Eng. Conf., 15th, 1976.”