ZIOMEK, A. Preface. Research Papers in Economics and Finance, [S. l.], v. 3, n. 1, p. 5–6, 2019. DOI: 10.18559/ref.2018.1.0. Disponível em: https://journals.ue.poznan.pl/REF/article/view/85. Acesso em: 5 may. 2024.