1. Alvey , N. G. et al. GENSTAT. A general statistical program, Rothamsted Experimental Station, Hertfordshire, U.K 1977
2. Efficiency of a transport medium for the recovery of aerobic and anaerobic bacteria from applicator swabs;Barry;Appl. Microbiol.,1972
3. Evaluation of bacteriological transport media;Christian;Am. J. Med. Technol.,1973
4. Dowell , V. R. Hawkins , T. M. Laboratory methods in anaerobic bacteriology. Publication no. 8272. Center for Disease Control, Atlanta 1974 3