41.
H. Hedlund, V. Ronin, and J.-E. Jonasson: Ecological Effective High Performance Cement Based Binders”, 5th International Symposium on Utilization of High Strength/High Performance Cement, Sandefjord, Ed. by I. Holand and E. J. Sellevold, Norwegian Concrete Association, p. 1144, Oslo 1999.