The Doppler effect for scattering by plane boundaries at normal incident

For original papers see ibid., vol.AP-28, p.791-95 (1980) and also ibid., vol.AP-29, p.639-37 (1981). In the analysis of the one-dimensional scattering problem involving a velocity dependent boundary, the simple example of the harmonically vibrating boundary has been considered in detail. It appears that the authors were unaware of existing work by the author of the present note, which includes the De Smedt construct employed by Van Bladel and De Zutter. In the interest of obviating future repetition and duplication, it seems worthwhile to call the attention of readers to earlier results and related studies