Piercy, J. (1994) “The draft international standard method (ISO/DIS 9613-2) for calculating the attenuation of sound during propagation outdoors”, Canadian Acoustics, 22(3), pp. 123–124. Available at: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/880 (Accessed: 20 February 2025).