Hutchinson, D. N., Salmon, R. L., Thornton, L., Gray, S., Bingham, P., Salmon, R. A., …Syed, Q. U. (1993). The problems of tracing a geographically widespread outbreak of salmonellosis from a commonly eaten food: Salmonella typhimurium DT193 in North West England and North Wales in 1991. Epidemiology and Infection, 111(3), 465-472. https://doi.org/10.1017/S0950268800057198