7WANG Li-jiu, AI Hong-mei.Calculation of sand-aggregate ratio and water dosage of ordinary concrete[J].Coment and Concrete Research, 2002, 32(3) :4-32.
10Wang Jizong, Ni Hongguang, He Jinyun. The Application of Automatic Acquisition of Knowledge to Mix Design of Concrete. Cement and Concrete Researeh,1999,29(12):1875- 1 880.