Mainier, F. B., A. C. M. Rocha, C. H. F. Alves, and R. J. Mainier. “Critical View of Ultrasonic Removal Applied to Industrial Effluents”. Asian Journal of Engineering and Technology, vol. 1, no. 4, Oct. 2013, https://ajouronline.com/index.php/AJET/article/view/496.