Saputra, M. W. D., M. A. Anshori, and A. M. Imammuddien. “Estrus Cycle Monitoring System in Cow Based on IoT”. Journal of Telecommunication Network (Jurnal Jaringan Telekomunikasi), vol. 13, no. 3, Sept. 2023, pp. 265-73, http://jartel.polinema.ac.id/index.php/jartel/article/view/594.