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2. - Some remarks on the vegetation of tropical inselbergs: diversity and ecological differentiation;Barthlott;Biogeographica,1993
3. - Cryptoendolithic algal communities of the Colorado Plateau;Bell;Journal of Phycology,1986
4. - Zur Systematik und Biologie der Flechtengattungen Heppia und Peltula im südlichen Afrika;Büdel;Bibliotheca Lichenologica,1987
5. - Rock inhabiting blue-green algae/cyanobacteria from hot arid regions;Büdel;Algological Studies,1991