1. Angelotti, R., J. L. Wilson, W. Litsky, W. G. Walter: Comparative evaluation of the cotton swab rodac methods for the recovery ofBacillus subtilis spores contamination from stainless steel surfaces. Science1, 289 (1964).
2. A.P.H.A.: Standard Methods for the Examination of Water Sewage and Industrial Wastes. Twelfth Edition, Amer. Public Health Assoc. (New York 1965).
3. Buttiaux, R.: Lesstreptocoques fécaux des intestins humains et animaux. Ann. Inst. Pasteur94, 778 (1958).
4. Deibel, R. H., J. H. Silliker: Food poisoning potential of the enterococci. J. Bacteriol.85, 827 (1963).
5. El-Zanfaly, H. T., A. A. Ibrahim: Boulti (Tilapia nilotica Linn.) fish paste. 2. Bacteriological studies of the raw fish and the produced paste. Z. Ernährungswis.19, 163 (1980).