1Lindsay JR, Duffy NA, MCKillop AM, et al. Inhibitiong of dipeptidyl peptidase IV activity by oral metformin in type 2 diabetes[J]. Diabet Med, 2005,22 : 654-657.
2Hinke SA , Kuhn-Wache K, Hoffmann T, et al. Metformin effects on dipeptidylpeptidase IV degradation of glueagon-like peptide-1[J]. Biochem Biophy Res Commun, 2002,291 : 1302- 1308.