Michael T Knight, David W Wood, James F Black, Ginger Gosney, Robert O Rigney, James R Agin, Carol K Gravens, Sheila M Farnham,
Gram-negative identification card for identification of Salmonella, Escherichia coli, and other Enterobacteriaceae isolated from foods: collaborative study. Journal - Association of Official Analytical Chemists. ,vol. 73, pp. 729- 733 ,(1990) ,
10.1093/JAOAC/73.5.729