Lenart, Łukasz, and Mateusz Pipień. “Empirical Properties of the Credit and Equity Cycle Within Almost Periodically Correlated Stochastic Processes - the Case of Poland, UK and USA”. Central European Journal of Economic Modelling and Econometrics 7, no. 3 (July 30, 2015): 169–186. Accessed February 28, 2026. https://wydawnictwo.pan.pl/index.php/cejeme/article/view/174.