1. B. Mandelbort, Fractal objects, shape, chance and dimension Flammarion Editions.
2. Scientific method of making concrete;Abrams;Chem. Ind.,1923
3. Role of inert materials in concrete;Caquot,1937
4. On the compactness of hydraulic mortars;Féret,1892
5. Proportion for Concrete Am Contractor;Thompson,1907