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Luciana Zedda, The Epiphytic Lichens on Quercus in Sardinia (Italy) and Their Value as Ecological Indicators, Englera, No. 24, The Epiphytic Lichens on Quercus in Sardinia (Italy) and Their Value as Ecological Indicators (2002), pp. 3-457
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Luciana Zedda (2002) studied this question.
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