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2. Infective dose of Salmonella typhimurium in Cheddar cheese-brief report;D'Aoust;American Journal of Epidemiology,1985
3. A survey of hygienic condition of domestic dishcloths and tea-towels;Davis;Medical Officer,1968
4. Cross contamination during the preparation of frozen chickens in the kitchen;De Wit;Journal of Hygiene, Cambridge,1979