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, 2014. DOI: 10.12775/OeC.2013.023. Disponível em: https://apcz.umk.pl/OeC/article/view/OeC.2013.023. Acesso em: 8 jul. 2025.