KOLBA, Paweł M.; KOTKOWSKI, Radosław. Business Cycles Indicators and Short-term Forecasts of Polish Industry Production Index. Oeconomia Copernicana, [S. l.], v. 4, n. 3, p. 65–79, 2013. DOI: 10.12775/OeC.2013.023. Disponível em: https://journals.economic-research.pl/oc/article/view/431. Acesso em: 2 mar. 2024.