A.A. Maradudin and I. Simonsen, Rayleigh and Wood anomalies in the diffraction of acoustic waves from the periodically corrugated surface of an elastic medium, Low Temp. Phys. 42, (2016) [Fiz. Nizk. Temp. 42, 455-462, (2016)] DOI: https://doi.org/10.1063/1.4948617 .