1. American Concrete Institute 1971 Building code regulations for reinforced concrete. Detroit: A.C.I.
2. American Society for Testing Materials 1980 Uncoated 7-wire stress-relieved strandfor prestressed concrete: Standard A421 part 4. Philadelphia: A.S.T.M.
3. Armstrong W. E. 1983 Axially loaded concrete prisms with lateral confinement. Ph.D. thesis University of London.
4. Ben-Zvi E. Muller G. & Rosenthal I. publication SP-13. Detroit: A.C.I. 1966 Symposium on reinforced concrete columns