1. On the estimation of deflections in elastic-plastic frame structures;Heyman,1961
2. Analysis of deflections in elastic-plastic frames;Lind;J. Structural Div. ASCE (ST 3),1965
3. The Plastic Methods of Structural Analysis;Neal,1963
4. Plastic deformations of frames and linear programming;Sato;Trans. Arch. Inst.,1958
5. A systematic calculation of elastic-plastic deformation of frames at imminent collapse;Tanaka;Trans.Arch. Inst.,1961