1. Chemical properties of cement;Fregert;Berufsdermatosen,1972
2. Factors decreasing the content of water soluble chromate in cement;Fregert;Acta Dermato-venerologica,1973a
3. Correlation between alkali sulphate and water soluble chromate in cement;Fregert;Acta Dermato-venerologica,1973b
4. The solubility of cobalt in cement;Fregert;Contact Dermatitis,1978