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3. A. I. Prudentov, "Effect of shape of reinforced concrete piles on their bearing capacity," in: Bases, Foundations, and Underground Structures [in Russian], Vysshaya Shkola, Moscow (1967).
4. B. B. Broms, "Pile foundation — pile groups," Proceedings of the 6th European Conference on Soil Mechanics and Foundation Engineering, Vienna, March (1976).