1. Void spacing as a basis for producing air entrained concrete;Powers,1954
2. Air entraining admixtures;Klieger;ASTM STP No. 196-A, PCA Research Department Bulletin,1966
3. Chemical analysis and sources of air entraining admixtures for concrete;Halstead;Public Roads,1954
4. Admixtures present and future trends;Edmeades;Concrete,1986
5. Plasticisers and dispersing admixtures;Krieger,1980