LIS, Piotr. A Prediction of Cyclical Fluctuations in Economic Variables as a Challeng for Contemporary Economics. DEMO, Poland, v. 5, n. 11, p. 146–158, 2017. DOI: 10.18559/SOEP.2017.11.10. Disponível em: https://ojs34.fimagis.pl/index.php/demo/article/view/1062. Acesso em: 18 apr. 2026.