Siregar, I. P. S., R. Widyasari, and N. H. Prasetya. “A Weighted Markov Chain Application to Predict Consumer Price Index When Facing Pandemic Covid-19”. Quadratic: Journal of Innovation and Technology in Mathematics and Mathematics Education, vol. 1, no. 1, Apr. 2021, pp. 41-46, doi:10.14421/quadratic.2021.011-06.