Rideout, B., S. Dosso, and D. Hannay. “Underwater 3-D Passive Acoustic Bayesian Tracking of Pacific Walrus”. Canadian Acoustics, vol. 38, no. 3, Sept. 2010, pp. 28-29, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2228.