Kartika, Wisnu, Fariskha Novi Fauziah, and Ahmad Syaifudin. “Ovulation Time Calculation Software Based on Pascal Language”. Journal of Electrical Technology UMY 1, no. 3 (November 11, 2017): 143–147. Accessed September 16, 2025. https://journal.umy.ac.id/index.php/jet/article/view/4789.