1. Mineralization of fossil wood;Buurmann;Scr. Geol.,1972
2. Diagenesis of Sediments;Dapples,1967
3. Origin or precious opal;Darragh;Nature,1965
4. Quartzsynthese bei tiefen Temperaturen;Harder;Geochim. Cosmochim. Acta,1970
5. The nature of opal. I. Nomenclature and constituent phases;Jones;J. Geol. Soc. Aust.,1971