Nakashima, Ann, and Murray Hodgson. “Effect of the Ground Surface and Meteorological Conditions on the Active Control of a Monopole Noise Source”. Canadian Acoustics 31, no. 3 (September 1, 2003): 88–89. Accessed May 8, 2026. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1564.