1. The use of α-(N-γ-dl-glutamyl)-aminonitriles for the colorimetric determination of a specific peptidase in blood serum;Szbwczuk;Clin. Chim. Acta,1960
2. Synthesis of peptides in enzymic reactions involving glutathione;Hanes;Nature (Lond.),1950
3. Orlowski, M., and Szewczuk, A. A note on the occurrence of 7-glutamyl transpeptidase in human serum. Clin. Chim. Acta, in press.
4. Determination of aldolase in animal tissues;Sibley;J. Biol. Chem.,1949
5. Bestimmung und Eigenschaften der Serumaldolase;Bruns;Biochem. Z.,1954