1. 1) Lee, L. H. N : Non-Uniform Torsion of Tapered I-Beams, J. Franklin Inst., Vol. 262, pp. 37~44, 1956.7.
2. 2) Culver. C. G. and Preg. S. M : Elastic Stability of Tapered Beam-Columns, Proc. ASCE STD, Vol. 94, No. ST2, pp. 455~470, 1968.2.
3. 3) Shiomi. H and Kurata. M : Strength Formula for Tapered Beam-Columns, Proc. ASCE STD, Vol. 110, No. ST7, pp. 1630~1643, 1984.7.
4. 8) Maki, A. C. and Kuenzi, E. W. : Deflection and Stresses of Tapered Wood Beams, Research Paper, US Forest Service, Vol. 34, pp. 1~53, 1965.9