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Harald Kürschner, Syntaxonomy, Synecology and Life Strategies of a Saxicolous Bryophyte Community of Socotra Island, Yemen, Englera, No. 28, Biodiversity of Socotra Forests, Woodlands and Bryophyte (2006), pp. 163-174
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Harald Kürschner (2006) studied this question.
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