A. Aulia, Y. Udjaja, I. K. Wairooy, A. P. Hutama, D. K. Shabira, and S. Muhtadin "Android Application to Detect Cat Disease Using an Expert System", Advances in Science, Technology and Engineering Systems Journal, vol. 4, no. 5, pp. 158–162, 2019, doi: 10.25046/aj040521.