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Published in Acta Botánica Mexicana, in 1990, in volume 12, pages 13-19

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Published in Acta Botánica Mexicana, in 1989, in volume 5, pages 1-4

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Published in Acta Botánica Mexicana, in 1996, in volume 36, pages 77-83

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Published in Acta Botánica Mexicana, in 1997, in volume 39, pages 53-59

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Published in Acta Botánica Mexicana, in 1998, in volume 43, pages 57-66

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Published in Acta Botánica Mexicana, in 2003, in volume 63, pages 83-96

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