2M.Collepardi.Admixtures Used to Enhance Placing Characteristics of Concrete.Cement and Concrete Composites,20(1998).
3G.Ferrari,T. Cerulli,P.Clemente.Influence of carboxylic aid carboxylic ester superplasticizer on characteristics of cement mixtures,6th CANMET/ACI International Conference on Superplaticizers and Other Chemical Admixtures in Concrete,Nice, France,otc.2000.