Farrah Syafira, Aurelia, Respatiwulan, and Sri Subanti. “Estimation Parameter of Susceptible – Infected – Susceptible (SIS) Model With Maximum Likelihood Method Using Steepest Descent Approach to Spread of Typhoid Disease”. Proceeding Education, Science, and Technology International Conference  2, no. 1 (August 23, 2024): 53–64. Accessed December 29, 2024. http://103.97.100.158/index.php/edusciencetech/article/view/568.