The Journal of Automatic Chemistry 
Volume 9 (1987), Issue 3, Pages 105-112
doi:10.1155/S1463924687000245

Guidelines (1987) for classification, calculation and validation of conversion rates in clinical chemistry – International Federation of Clinical Chemistry, Scientific Committee, Analytical Section: Expert Panel on Analytical Systems, Expert Panel on Enzymes; IFCC Document Stage 2, Draft 4

G. Bechtler, R. Haeckel, M. Hørder, H. Küffer, and A. J. Porth