Initial role of the sulphates of a fly-ash in its pozzolanic character = Rôle initial des sulfates d'une cendre volante dans son caractère pouzzolanique /
Carles-Gibergues, A.
Stambolieva, R.
Vaquier, A.
Garston :  Building Research Establishment, 
1973.
Translated from Matériaux et Constructions, 1973, 6, 31, 29-38.