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.