To get:

Effect of flow on the acoustic resonances of an open-ended duct
J. Acoust. Soc. Am. Volume 58, Issue 4, pp. 788-793 (October 1975)
Issue Date: October 1975

Acoustic waves in ducts with sinusoidally perturbed walls and mean flow
Nayfeh, A. H.
Acoustical Society of America, Journal, vol. 57, May 1975, p. 1036-1039.

Title:
Standing acoustic waves in a low Mach number shear flow
Authors:
Wang, Meng; Kassoy, David R.

@ARTICLE{art:Yeh64,
author = "Y. Yeh and H. Z. Cummins",
title = "Localised flow measurements with an He-Ne laser spectrometer",
journal = "Applied Physics Letters",
year = "1964",
volume = "4",
pages = "176",
note = "I can't get this one online",
}