1. V. S. Kladinoga and V. L. Bogdanov, International Applied Mechanics 35(8), 829 (1999).
2. E. A. Shirokova and P. N. Ivanshin, Spline-Interpolation Solution of One Elasticity Theory Problem (Bentham Science E-books, 2011).
3. P. N. Ivanshin and E. A. Shirokova, Spline-interpolation solution of 3D Dirichlet problem for a certain class of solids, IMA Journal of Applied Mathematics. 2012; DOI: 10.1093/imamat/hxs009
4. I. N. Vekua, Soobshch. Akad. Nauk Gruz. SSR 3, 213 (1942) (in Russian).
5. I. Privalov and B. Pchelin, Mat. Sbornik 2(4), 745 (1937).