1. La Genista aetnensis (R.A.F.) DC in Sardegna;ARRIGONI;Webbia,1967
2. Anatomical studies in xerophytic apophyllous plants. I. Monttea aphylla, Bulnesia retama and Bredemeyera colletioides;BÖCHEK;Uet Kongtlige Danrke Videnskabernes Selskab, Biologiske Skrifter,1968
3. Anatomical studies in xerophytic apophyllous plants. II. Additional species from south american shrub steppes;BÖCHER;Det Kongelige Danske Videnkabernes Selskab, Biologiske Skrifter,1972