LIS, Piotr. A Prediction of Cyclical Fluctuations in Economic Variables as a Challeng for Contemporary Economics. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 5, n. 11, p. 146–158, 2017. DOI: 10.18559/SOEP.2017.11.10. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3754. Acesso em: 3 sep. 2026.