2. Recommendation of the German Society for Clinical Chemistry: Z. Klin. Chem. Klin. Biochem., 10, 281-291 (1972)
3. The Committee on Enzymes of the Scandinavian Society for Clinical Chemistry and Clinical Physiology: Scand. J. Clin. Lab. Invest., 33, 291-306 (1974)
4. International Federation of Clinical Chemistry: Clin. Chim. Acta, 147F-154F, 155F-166F, 167F-167E, 171F-172F (1980)