1. Chromium (III) and the glucose tolerance factor;Schwartz;Arch. Biochem. Biophys.,1959
2. Skogerson L.E. 1982 US Patent No. 4,348 Skogerson L.E. 1982 US Patent No. 4, 483 Method for the production of chromium yeast
3. Jensen N.L. 1990 US Patent No. 4,923 855 Synthetic GTF chromium material and process therefore
4. Chromium Picolinate Treatment;Boynton,1992
5. Method of synthesis of chromium amino acid nicotinate complex;Wong,1996