1) Connor, J. J., R.D. Logcher and S.C. Chan : Nonlinear Analysis of Elastic Framed Structures, ASCE, Vol. 94, No. ST6, Proc. Paper 6011, pp. 1525-4547, June, 1968.
2) Tezcan, S.S. and B.C. Mahapatra : Tangent Stiffness Matrix for Space Frame Members, ASCE, Vol. 95, No. ST 6, Proc. Paper 6627, pp. 1257-4270, June, 1969.
3) Chu, K.H. and R.H. Rampetsreiter : Large Defdection Buckling of Space Frames, ASCE, Vol. 98, No. ST 12, Proc. Paper 9455, pp. 2701-2722, December, 1972.