1. Über die Initialstadien der Schmelz-Karies und ihre Erzeugung in Kaubrei-Versuchen in vitro;Keil;Deutsche Zahn. Ztschr,1949
2. The Distribution of the Enamel Cuticle and Its Significance;Darling,1943
3. Studies of the Early Lesions of Enamel Caries With Transmitted Light;Darling;Brit. D. J,1956
4. Studies of the Early Lesions of Enamel Caries With Transmitted Light;Darling;Brit. D. J,1956
5. Effect of Lactate Buffers on Dental Enamel In Vitro as Observed in Polarizing Microscope;Hals;Acta odont. scandinav,1955