2 citations to https://www.mathnet.ru/rus/mzm11712

1. V. Barrera-Figueroa, S. Rabinovich, A. Cristina, “Asymptotic and numerical analysis of slowly varying two-dimensional quantum waveguides”, J. Phys. A-Math. Theor., 55:9 (2022), 095202      
2. S. A. Nazarov, L. Chesnel, “Transmission and trapping of waves in an acoustic waveguide with perforated cross-walls”, Fluid Dyn., 56:8 (2021), 1070–1093