“STUDYING PERFORMANCE OF WATER AND WASTEWATER COMPANY USING THE APPROACH OF EFQM EXCELLENCE MODEL IN GUILAN PROVINCE-IRAN”, SJBEM, vol. 5, no. (1), pp. 51–60, Jan. 2016, Accessed: Jun. 24, 2026. [Online]. Available: https://singaporeanjbem.com/index.php/SJBEM/article/view/304