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Yusof, W.Z. (1990) Non-syndrome multiple supernumerary teeth: literature review. Journal (Canadian Dental Association), 56 (2). pp. 147-9. ISSN 0709-8936, DOI 2407326.
Zain, R.B. and Fei, Y.J. (1990) Fibrous lesions of the gingiva: a histopathologic analysis of 204 cases. Oral Surgery Oral Medicine and Oral Pathology, 70 (4). pp. 466-470. ISSN 1079-2104, DOI https://doi.org/10.1016/0030-4220(90)90212-B .
Zain, R.B. and Fei, Y.J. (1990) Peripheral fibroma/fibrous epulis with and without calcifications. a clinical evaluation of 204 cases in Singapore. Odonto-stomatologie tropicale = Tropical dental journal, 13 (3). pp. 94-96. ISSN 0251-172X,
Zain, R.B. and Siwamogstham, P. and Axell, T. and Thampipit, J. and Tantiniran, D. (1990) Prevalence of oral soft-tissue lesions in out-patients at 2 Malaysian and Thai dental schools. Community Dentistry And Oral Epidemiology, 18 (2). pp. 95-99. ISSN 0301-5661, DOI https://doi.org/10.1111/j.1600-0528.1990.tb00026.x.
