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2. Polyploidy and self-fertilization in flowering plants;Barringer;American Journal of Botany,2007
3. Asplenium × reichsteinii (= Asplenium fontanum × A. majoricum; Aspleniaceae: Pteridophyta), a new endemic fern hybrid from Mallorca, Balearic Islands;Bennert;Fern Gazette,1987
4. Asplenium petrarchae (Guérin) DC. subsp. bivalens und Asplenium × helii nothosubsp. calobrense – Neufunde auf der Insel Mallorca;Bennert;Farnblätter,1990
5. Ecological and genetic consequences of polyploidy in Arctic Draba (Brassicaceae);Brochmann;Evolutionary Trends in Plants,1992