1. Kvittingen J (1984) Pilot studies with an apparatus for automatic bacteriological testing of water. Zentralbi Bakteriol I Orig B179: 596–604
2. Singh P, Oliver DG, Allison D, Jang L, Azam M (1988) Immunochemical testing of pathogens in a slaughterbhouse. Abstr Annu Meet Am Soc Microbiol, P 51, p 282
3. Hill G, Schalkowsky S (1990) Development and evaluation of the spiral gradient endpoint method for susceptibility testing of anaerobic gram-negative bacilli. Rev Infect Dis 12 (Suppl 2): S200 - S209
4. Zipkes MR, Gilchrist JE, Peeler JT (1981) Comparison of yeast and mold counts by spiral, pour and streak plate methods. J Assoc Off Anal Chem 64: 1465–1469
5. Peeler JT, Leslie JE, Danielson JW, Messer JW (1982) Replicate counting errors by analysts and bacterial colony counters. J Food Prot 45: 238–240