1. J.C. King, Preplaced aggregate concrete for structural and mass concrete, Am Concr Inst 67 (4) (1970) 360–362.
2. R.E. Davis, Prepakt method of concrete repair, Am Concr Inst Proc 57 (2) (1960) 155–172.
3. Experimental-mathematical procedure of designing the two-stage concrete, Ph.D. Dissertation;Abdelgader,1995
4. H.S. Abdelgader, Effect of the quantity of sand on the compressive strength of two-stage concrete, Mag Concr Res 48 (177) (1996) 353–360.
5. Polcrete—two-stage concreting method;Braun;Zesz Nauk Politechniki GdaÒskiej, GdaÒsk, Poland, XVI (,1967