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van Steenbergen TJ, Van der Velden U, Abbas F, de Graaff J.van Steenbergen TJ, et al. Among authors: abbas f.J Periodontol. 1991 Apr;62(4):235-41. doi: 10.1902/jop.1991.62.4.235.J Periodontol. 1991.PMID: 1645404
van Winkelhoff AJ, Abbas F, Pavicic MJ, de Graaff J.van Winkelhoff AJ, et al. Among authors: abbas f.Ned Tijdschr Geneeskd. 1991 Dec 28;135(52):2489-91.Ned Tijdschr Geneeskd. 1991.PMID: 1758517Dutch.
van Winkelhoff AJ, Abbas F, Pavicic MJ, de Graaff J.van Winkelhoff AJ, et al. Among authors: abbas f.J Clin Microbiol. 1991 Apr;29(4):723-5. doi: 10.1128/jcm.29.4.723-725.1991.J Clin Microbiol. 1991.PMID: 1890173Free PMC article.
Goené RJ, Winkel EG, Abbas F, Rodenburg JP, van Winkelhoff AJ, de Graaff J.Goené RJ, et al. Among authors: abbas f.J Periodontol. 1990 Jan;61(1):61-4. doi: 10.1902/jop.1990.61.1.61.J Periodontol. 1990.PMID: 2179514
Sastrowijoto SH, Abbas F, Abraham-Inpijn L, van der Velden U.Sastrowijoto SH, et al. Among authors: abbas f.J Clin Periodontol. 1990 Jan;17(1):55-60. doi: 10.1111/j.1600-051x.1990.tb01048.x.J Clin Periodontol. 1990.PMID: 2295709
Abbas F, Voss S, Nijboer A, Hart AA, Van der Velden U.Abbas F, et al.J Clin Periodontol. 1990 Mar;17(3):199-203. doi: 10.1111/j.1600-051x.1990.tb01086.x.J Clin Periodontol. 1990.PMID: 2319006
Van der Velden U, Abbas F, Van Steenbergen TJ, De Zoete OJ, Hesse M, De Ruyter C, De Laat VH, De Graaff J.Van der Velden U, et al. Among authors: abbas f.J Periodontol. 1989 Nov;60(11):604-10. doi: 10.1902/jop.1989.60.11.604.J Periodontol. 1989.PMID: 2600747