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3. Winterkorn "Physio-Chemical Properties of Soils" Proc. of Second Int. Conf. on Soil Mechanics and Foundation Engineering 1948 Vol. I.
4. Handbook of Engineering Fundamentals;Eshbach W.;John Wily & Sons
5. Grasshoff "Investigation of Values of the Dynamic Penetration Resistance to Model Piles in Sand and Clay Obtained from Tests." Proceedings of 3rd Int. Conf. on Soil Mechanics and Foundation Engineering 1953.