1. Chen WF: End Restraint and Column Stability. Journal of the Structural Division, ASCE, 106, No. ST 11, Proc. Paper 15796, 1980.
2. Barros RC: Buckling Analysis of End Restrained Imperfect Tubular Beam Co lumns. Ph.D. Dissertation, The University of Akron, Akron, Ohio, 1983.
3. Barros RC: Review of Elasto-Plastic Buckling of Tubular Beam Columns. En genharia, Ano 1, no 4, F.E.U.P., Porto, Janeiro-Abril 1984.
4. Chen WF and Atsuta T: Theory of Beam-Columns, Vol. 2, Space Behavior and Design. New York: Mc Graw-Hill Book Company, Inc, 1978.
5. Crisfield MA: A Fast Incremental/iterative Solution Procedure that handles Snap-through. Computers and Structures, 13, 1981.