1. A.A. Stravs and U. von Stockar, in Proc. 180th Annual Meeting of American Chemical Society, Division of Microbial and Biochemical Technology, San Francisco, CA, August 24–29, 1980
2. W.J. Schmidt, W. Kuhlmann, H.D. Meyer, K.H. Bellgardt and K. Schügerl, Anal. Chim. Acta, in press
3. A.S. Afschar, 1984, in preparation
4. A. Ross, 1984, in preparation