Shean, Wong Poh, et al. “EFFECTS OF METFORMIN IN COMBINATION WITH INSULIN ON GLYCAEMIC VARIABILITY IN OVERWEIGHT OR OBESE PATIENTS WITH TYPE 1 DIABETES MELLITUS”. Journal of the ASEAN Federation of Endocrine Societies, vol. 37, July 2022, p. 1, https://asean-endocrinejournal.org/index.php/JAFES/article/view/2189.