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Thong, Kwai Lin and Cheong, Y.M. and Puthucheary, S. and Koh, C.L. and Pang, T. (1994) Epidemiologic analysis of sporadic Salmonella typhi isolates and those from outbreaks by pulsed-field gel electrophoresis. Journal of Clinical Microbiology, 32 (5). pp. 1135-41. ISSN 0095-1137, DOI 7914202.