PERFORMANCE MEASURE OF MULTIPLE-CHANNEL QUEUEING SYSTEMS WITH IMPRECISE DATA USING GRADED MEAN INTEGRATION FOR TRAPEZOIDAL AND HEXAGONAL FUZZY NUMBERS. JCIA [Internet]. 2022 Jul. 31 [cited 2025 Nov. 10];1(2):1-13. Available from: https://www.educationmalaysia.co.uk/index.php/jcia/article/view/15197