The use of lighter-weight blastfurnace slag as dense coarse aggregate in concrete /
Gutt, Wittold Henryk.
Teychenné, David Clayton.
Harrison, W. H.
Garston :  Building Research Establishment, 
1974.
Reprinted from Magazine of Concrete Research, vol. 26, no. 88, September 1974, pp. 123-143.