CZUBA, Michał. Opportunities and barriers of marketing innovation in municipal services sector. Forum Scientiae Oeconomia, [S. l.], v. 3, n. 3, p. 77–85, 2015. Disponível em: https://ojs.wsb.edu.pl/index.php/fso/article/view/256. Acesso em: 18 sep. 2026.