LENDEL, Viliam; VARMUS, Michal. Proposal of innovative approaches of relationship marketing in business. Business: Theory and Practice, [S. l.], v. 16, n. 1, p. 63–74, 2015. DOI: 10.3846/btp.2015.434. Disponível em: https://journals.vilniustech.lt/index.php/BTP/article/view/8306. Acesso em: 31 may. 2025.