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Beltrán-Porter A, Beltrán-Porter D, Cervilla A, Ramirez JA.Beltrán-Porter A, et al. Among authors: beltran porter d.Talanta. 1983 Feb;30(2):124-6. doi: 10.1016/0039-9140(83)80031-9.Talanta. 1983.PMID: 18963330