KRYLOV, V.V., 1989. Conditions for validity of the geometrical-acoustics approximation in application to waves in an acute-angle solid wedge. Soviet Physics - Acoustics, 35 (2), pp.176-180.
The conditions under which flexural and longitudinal waves in an acute-angle solid wedge can be described in the geometrical-acoustics approximation are determined. The results are used to formulate a ray theory of
waveguide modes in a solid wedge i.e. so-called acoustic wedge modes.