ĆWIĄKAŁA-MAŁYS, Anna; PIOTROWSKA, Iwona. The Problem of the Grey Area in e-Trade in Poland. Regional Barometer. Analyses & Prognoses, [S. l.], v. 15, n. 3, p. 41–49, 2018. DOI: 10.56583/br.423. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/423. Acesso em: 16 apr. 2025.