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2. Nielsen M. P. Limit Analysis and Concrete Plasticity Prentice-Hall, Englewood Cliffs, New Jersey, 1984.
3. Nielsen M. P. Limit Analysis and Concrete Plasticity, 2nded. CRC Press, Boca Raton, 1999.
4. British Standards Institution. Eurocode 2: Design of Concrete Structures, Part 1-1 General Rules. BSI, London, 2004, BS EN 1992-1-1.