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J. E. Rivera-Hernández, S. H. Salas-Morales, and E. Torres-Bahena, “Ceratozamia euryphullidia Vázquez Torres, Sabato & Stevenson (Zamiaceae), a new record for Oaxaca, with comments on their habitat and altitudinal distribution”, Bot. Sci., no. 67, pp. 107 - 109, Dec. 2000.