1. Boron in Swedish and Norwegian fresh waters;Ahl;Ambio,1972
2. Sponges;Bergquist,1978
3. Nonessentiality of boron in fungi and the nature of its toxicity;Bowen;Plant. Physiol.,1966
4. Deposition and diagenesis of silica in marine sediments;Calvert,1974
5. Part E: Porifera, in Treatise on Invertebrate Paleontology;Delaubenfels,1955