Articles (published in different Journals)

• Echeveria agavoides and the mysterious variety corderoyi
• Some Notes on South American Echeverias
• Historical Notes on Echeveria I
• An Account of the Hybrid Genus x Graptoveria I

Articles (published in Succulenta nl )

• Echeveria agavoides en de mysterieuze varieteit corderoyi (Succulenta 55(9), 1976)
• Echeveria setosa Rose et Purpus (Succulenta 55(7), 1976)
• Echeveria DC. Historie en nomenclatuur (Succulenta 55(11), 1976