1. AMES, B.N., J. MC CANN, and E. YAMASAKI: Mutation Res.316, 347 (1975).
2. BRINGMANN, G. and F. KAHN: Wass. Ab. Wass. Forsch (Gr) 10.3/4.87 (1977).
3. COWAN, S.T. and K.J. STEEL: Manual for the Identification of Medical Bacteria, Cambridge U. Press (1970).
4. DIETZ, A.S., T. TUOMINEN, and L.J. ALBRIGHT: in Proc. 3rd. Intl. Biodeg. Symp., J.M. Sharpley and A.M. Kaplan (eds.) Appl. Sci. Pub. Ltd., London 1083 (1976).
5. GREEN, M.H.L., B.A. BRIDGES, A.M. ROGERS, G. HORSPOOK, W.J. MURIEL. J.W. BRIDGES, and J.R. FRY: Mutation Res.48, 287 (1977).