Ulfah M, ArianaF, Lintang TrenggonowatiD. IMPROVEMENT OF PRODUCT QUALITY THROUGH SIX SIGMA AND FUZZY MARKETING MIX APPROACHES. J.Tek.Ind.Pert. [Internet]. 2021Jul.1 [cited 2024May3];31(1):1-11. Available from: https://jurnal.ipb.ac.id/index.php/jurnaltin/article/view/35863