CARAWAY, W. T. A stables starch substrate for the determination of amylase in serum and other body fluids. Am. J. Clin. Pathol. 1959, 32, 97-99
RICHMOND, W. Preparation and properties of a cholesterol oxidase from nocardia sp. and its application to the enzymatic assay of total cholesterol in serum. Clin. Chem. 1973, 19, 12, 1350-1356