Innovative Price Adjustments Technique for Thermal Coal: A Study of Operation Function under changing Techno Environment. Global Journal of Management and Business Research, [S. l.], v. 13, n. C4, p. 9–12, 2013. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/976. Acesso em: 19 feb. 2026.