1) Rausch, E.: Design of Reinforced Concrete in Torsion, Technische Hochschule Berlin, pp. 53, 1929.
2) Lessig, N. N.: Determination of Load-Carrying Capacity of Rectangular Reinforced Concrete Elements Subjected to Flexure and Torsion, Trudy No. 5, Institut Betonai Zhelezabetona (Concrete and Reinforced Concrete Institute), Moscow, pp. 5-28 (in Russian), Translated by Portland Cement Association, Foreign Literature Study, No. 371.
3) Collins, M. P. and Mitchell, D.: Shear and Torsion Design of Prestressed and Non-prestressed Concrete Beams, PCI Journal, Vol. 25, No. 5, pp. 32-100, Sept. -Oct. 1980.
4) Hsu, T. T. C. and Mo, Y. L.: Softening of Concrete in Torsional Members, Univ. of Houston, Civil Eng. Dept., Research Report, pp. 1-107, March 1983.
5) Rangan, B. V., Staley, R. F. and Hall, A. S.: Behavior of Concrete Beams in Torsion and Bending, Journal of the Structural Division, ASCE, V. 103, ST-4, pp. 759-772, Apr. 1978.