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Ngeow, W. C. and Zain, R. B. and Yeo, J. F. and Chai, W. L. (1999) Clinicopathologic study of odontogenic keratocysts in Singapore and Malaysia. Journal of Dental Research, 78 (5). p. 1180. ISSN 0022-0345
Loh, H. S. and Ling, S. Y. and Shanmuhasuntharam, P. and Zain, R. B. and Yeo, J. F. and Khoo, S. P. (1998) Trigeminal neuralgia. a retrospective survey of a sample of patients in Singapore and Malaysia. Australian Dental Journal, 43 (3). pp. 188-191. ISSN 0045-0421
Zain, R. B. and Khoo, S. P. and Yeo, J. F. (1995) Oral pyogenic granuloma (excluding pregnancy tumour)--a clinical analysis of 304 cases. Singapore Dental Journal, 20 (1). pp. 8-10.