Advances in fluorine research and dental caries prevention. Proceedings of the 9th congress of the European Organization for Research on Fluorine and Dental Caries Prevention, Paris, 28th-30th June, 1962 / 
European Organization for Research on Fluorine and Dental Caries Prevention.
Hardwick, J. L.
Dustin, J.-P.
Held, Hans R.
Oxford, 
1963-1966.