Su-Wen Lim, Hwei-San Loh, Kang-Nee Ting, Tracey Dawn Bradshaw, and Zeenathul Nazariah Allaudin, “Reduction of MTT to Purple Formazan by Vitamin E Isomers in the Absence of Cells”, tlsr, vol. 26, no. 1, pp. 111–120, Jul. 2015, Accessed: Jun. 06, 2025. [Online]. Available: http://ejournal.usm.my/tlsr/article/view/tlsr_vol26-no-1-2015_10