1. Project E1: Atlas of Namibia Project,2002
2. Las plantas suculentas (Crassulaceae) endémicas de las islas Canarias;Bañares Baudet,2015
3. The greater Cape floristic region;Born;J. Biogeogr.,2007
4. Landscapes, rock types, and climate of the greater Cape floristic region;Bradshaw,2014
5. Crassula, insights into an old, arid-adapted group of southern African leaf-succulents;Bruyns;Mol. Phylogenet. Evol.,2019