KozakP.S., LuzM.M., and MoklyachukM.P. “Minimax Prediction of Sequences With Periodically Stationary Increments”. Carpathian Mathematical Publications 13, no. 2 (August 18, 2021): 352-376. Accessed January 25, 2022. https://journals.pnu.edu.ua/index.php/cmp/article/view/3949.