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3. The petD group II intron as a species level marker: Utility for tree inference and species identification in the diverse genus Campanula (Campanulaceae);Borsch;Willdenowia,2009
4. Comparative palynology in Campanulaceae;Chapman;Trans. Kansas Acad. Sci.,1967
5. On pollen of Campanulaceae and related families with special reference to the surface ultrastructure I. Campanulaceae subfam. Campanuloideae;Dunbar;Bot. Notiser,1975a