1. N. Kh. Arutyunyan and B. L. Abramyan,Torsion of Elastic Bodies [in Russian], Fizmatigiz, Moscow (1963).
2. M. P. Savruk, ?Integral equations of axially symmetric torsion problems for elastic bodies with cracks?,Fiz.-Khim. Mekh. Mater. 25, No. 6, 37?44 (1989).
3. V. V. Panasyuk, M. P. Savruk, and Z. T. Nazarchuk,Method of Singular Integral Equations in Two-Dimensional Problems of Diffraction [in Russian], Dumka, Kiev (1984).
4. S. Ch. Das, ?Stress concentrations around small spherical or spheroidal inclusions on the axis of a circular cylinder in torsion?,J. Appl. Mech. 21, No. 1, 73?87 (1954).
5. Ching-Bing Ling, ?Torsion of a circular cylinder having a spherical cavity,?Quart. Appl. Math. 10, No. 2, 149?156 (1952).