1. Proc of the Fifth Intern. Conf. on Alkali-Aggregate Reaction in Concrete;Skalny,1981
2. Proc of the Fifth Intern. Conf. on Alkali-Aggregate Reaction in Concrete;Gebauer,1981
3. Bulletin No 17 of the NBRI;van Aardt,1959
4. Bulletin No 13 of the NBRI;van Aardt,1955