GOEV, Valentin; BOSHNAKOV, Venelin. Grey Economy and Perspectives of Bulgarian Businesses Development in the EU Accession Period. Ekonomika, [S. l.], v. 84, p. 29–39, 2008. DOI: 10.15388/Ekon.2008.17684. Disponível em: https://www.journals.vu.lt/ekonomika/article/view/17684.. Acesso em: 2 may. 2024.