Lu, Yigang, and Hengling Song. “Development Of A Method To Realize A Uniform Sound Field In Three- Dimensional Spaces Based On The Ray-Tracing Algorithm”. Canadian Acoustics 46, no. 3 (November 1, 2018): 5–14. Accessed October 20, 2021. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3213.