Chen, C.-H., C.-H. Hung, Y.-Y. Lee, and X.-L. Chen. “Ultrasonic Characteristics for Gel Formation in the California Mastitis Test”. Canadian Acoustics, vol. 39, no. 3, Sept. 2011, pp. 44-45, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2402.