Щелкалін, Віталій Миколайович. “The Systems Approach to Building Class Models for Forecasting of Interrelated Nonstationary Time Series”. Technology audit and production reserves 5, no. 2(7) (September 6, 2012): 41–42. Accessed July 20, 2024. https://journals.uran.ua/tarp/article/view/4840.