Kabuya K, Olanrewaju OA, Lazarus IJ. IMPROVING ENERGY USAGE IN COMMERCIAL BUILDINGS USING SIX SIGMA DMAIC. S AFR J IND ENG [Internet]. 2023Aug.25 [cited 2024May20];34(2):138-51. Available from: http://sajie.journals.ac.za/pub/article/view/2392