1. 1) FURLONG R. W. Design of steel-encased concrete beam-columns. ASCE J. of Struct. Div.. (1968) vol.94, no.ST1, p.267-281.
2. 2) NEOGI P. K. Concrete-filled tubular steel columns under eccentric loading. The Structural Engineer. (1969) vol.47, no.5, p.187-195.
3. 3) KNOWLES R. B. Strength of Concrete Filled Steel Tubular Column. ASCE J. of Struct. Div.. (1969) vol.95, no.ST12, p.2565-2587.