RYTEL, Tomas. Critical Insights of Customer Valuation Methods in the Relationship Marketing Paradigm. Ekonomika, [S. l.], v. 74, p. 52–63, 2006. DOI: 10.15388/Ekon.2006.17570. Disponível em: https://www.journals.vu.lt/ekonomika/article/view/17570. Acesso em: 6 dec. 2025.