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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,