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2. Plastizitätstheorie und ihre Anwendung auf Festigkeitsprobleme;Reckling,1967
3. Plastic strength and deflections of continuous beams;Knudsen;Welding Res. Supp.,1953
4. Approximate method of displacement evaluation in elastic-plastic beams and frames;Bandyszewski;Arch. Inż. La̧d.,1974
5. An improved upper bound to maximum deflections of elastic-plastic structures at shakedown;Dorosz;J. Struct. Mech.,1978