Chikhalsouk, M., and R. Bhat. “Reduction of Noise Generating Flow Fluctuations in Hydraulic Systems Driven by Swash Plate Pumps through Improved Port Plate Design”. Canadian Acoustics, vol. 35, no. 3, Sept. 2007, pp. 186-7, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1961.