1. J. J. Stoker, Water waves. The Mathematical Theory with Applications, Reprint of the 1957 original, John Willey & Sons, Inc., New York (1992).
2. N. Kuznetsov, V. Maz’ya, and B. Vainberg, Linear Water Waves, Cambridge Univ. Press, Cambridge (2002).
3. C. C. Mei, M. Stiassnie, and D. K.-P. Yue, Theory and Applications of Ocean Surface Waves. Part 1: Linear Aspects, World Scientific (2005).
4. S. A. Nazarov and J. Taskinen, “On the spectrum of the Steklov problem in a domain with a peak” [in Russian], Vestn. St-Peterbg. Univ., Ser. I, Mat. Mekh. Astron. No. 1, 56–65 (2008);
5. English transl.: Vestn. St. Petersbg. Univ., Math.