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F. J. Bolton , D. Coates , D. N. Hutchinson & A. F. Godfree (1987). A study of thermophilic campylobacters in a river system. Journal of Applied Bacteriology 62, 167–176.
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J. C. Coulson , C. S. Thomas , J. E. L. Butterfield , N. Duncan , P. Monagiian & C. Shedden (1983). The use of head and bill length to sex live gulls (Laridae). Ibis 125, 549–557.
N. Horton , T. Brough & J. B. A. Rochard (1983). The importance of refuse tips to gulls wintering in an inland area of south–east England. Journal of Applied Ecology 20, 751–765.
D. M. Jones , J. D. Abbott , M. J. Painter & E. M. Sutcliffe (1984). A comparison of biotypes and serotypes of Campylobacter spp. isolated from patients with enteritis and from animal and environmental sources. Journal of Infection 9, 51–58.
M. A. Karmali , J. L. Penner , P. C. Fleming , A. Williams & J. N. Hennessy (1983). The serotype and biotype distribution of clinical isolates of Campylobacter jejuni and Campylobacter coli over a three year period. Journal of Infectious Diseases 147, 243–246.
P. Monaghan & J. C. Coulson (1977). Status of large gulls nesting on buildings. Bird Study 24, 89–104.
W. J. Reilly , G. I. Forbes , G. M. Paterson & J. C. M. Sharp (1981). Human and animal salmonellosis in Scotland associated with environmental contamination, 1973–1979. Veterinary Record 108, 553–555.