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Smith, A.P, Thomas, M, Perry, K and Whitney, H (1997) 'Caffeine and the common cold.' Journal of Psychopharmacology, 11 (4). pp. 319-324. ISSN 0269-8811
Smith, A.P, Whitney, H, Thomas, M, Brockman, P and Perry, K (1995) 'A comparison of the acute effects of a low dose of alcohol on mood and performance of healthy volunteers and subjects with upper respiratory tract illnesses.' Journal of Psychopharmacology, 9 (3). pp. 267-272. ISSN 0271-0749