1. Bülow, P.: The ONPG test in diagnostic bacteriology. Acta path. microbiol. scand.60, 376–386 (1964)
2. Cowan, S. T., Steel, K. J.: Manual for the identification of medical bacteria. London: Cambridge University Press 1970
3. DiSalvo, I. V.: Deoxyribonuclease and coagulase activity of Micrococcia. Med. Techn. Bull.9, 191–196 (1958)
4. Edwards, P. R., Bruner, D. W.: Serological identification of Salmonella cultures. Circ. Ky. Agric. Exp. Sta. No. 54 (1942)
5. Edwards, P. R., Ewing, W. H.: Identification ofEnterobacteriaceae. Third edition. Minneapolis: Burgess Publ. Comp. 1972