Simpson, Nicholas E., and Ioannis Constantini. 2007. “13C NMR Isotopomeric Analysis and Its Application in the Study of Endocrine Cell Metabolism and Function”. Acta Biomedica Atenei Parmensis 78 (1Suppl): 99-112. https://mattioli1885journals.com/index.php/actabiomedica/article/view/4614.