Polonsky,KS et al: Abnormal patterns of insulin secretion in non-insulin-dependent diabetes mellitus. N Eng J Med. 318 (19) 1231, 1988
UK Prospective Diabetes Study Group: UK. Prospective diabetes study 16. Overview of 6 years therapy of type 2 diabetes: a progressive disease. Diabetes .44 (11) 1249-58, 1995
Ahren B et al: Improved Meal-related beta cell function and insulin sensitivity by DPP-4 inhibitor Vildagliptin in metformin-treated patients with type 2 diabetes over lyear. Diabetes Care. 28: 1936-1940, 2005
E. Bosi et al: Vildagliptin plus metformin combination therapy provides superior glycaemic control to individual monotherapy in treatment-naïve patients with type 2 diabetes mellitus. Diabetes, Obesity and Metabolism. 11, 506-515, 2009