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2. Inelastic cycles of axially loaded steel members;Kahn;J. Struct. Div. ASCE,1976
3. Seismic analysis of some steel building frames;Popov;J. Eng. Mech. Div.,1976
4. Cyclic inelastic buckling of thin tubular columns;Popov;J. Struct. Div., ASCE,1977
5. Inelastic cyclic behaviour of tubular braces frames;Popov;J. Struct. Div., ASCE,1980