Hazard and Lenoir 1993
C. Hazard and M. Lenoir, Determination of Scattering Frequencies for an Elastic Floating Body, SIAM J. Math. Anal., 24(4), pp. 1458-1514, 1993.
This paper presented a mathematically focused derivation of Scattering Frequencies (which did not depend on the body being elastic) and a solution for the two dimensional problem of a catamaran connected by a thin plate above the water line.