Behaviour of the whispering gallery rays in a vicinity of a point where curvature of the boundary vanishes
A. I. Lanin, M. M. Popov

This publication is cited in the following articles:

1. E. A. Zlobina, “Difraktsiya volny shepchuschei galerei na skachke krivizny. Moda s bolshim nomerom”, Matematicheskie voprosy teorii rasprostraneniya voln. 53, Zap. nauchn. sem. POMI, 521, POMI, SPb., 2023, 95–122  
2. J. Math. Sci. (N. Y.), 128:2 (2005), 2782–2786