6Townsend D E. Comparsion of the simplate coliform and escherichia coli test with petrifilm, there - tube MPN, and VRBA + MUG methods for enumerating eoliforms and Eeoli in food.J Food Protection,1998,61(4) :444 - 449.
7Taylor, Steve L. Safety Assessment of Foods Produced Through Agricultural Biotechnology. Nutrition Reviews;Jun2003 Part 2 of 2,Vol. 61 Issue 6,psl135,6p.
