1. V. I. Gulyaev, V. V. Gaidaichuk, and V. L. Koshkin, Elastic Deformation, Stability, and Vibrations of Flexible Curved Bars [in Russian], Naukova Dumka, Kyiv (1992).
2. V. I. Gulyaev, V. V. Gaidaichuk, S. M. Khudolii, and L. V. Glovach, “Modern methods for theoretical simulation of the behavior of drillstrings during directional drilling,” Naft. Gaz. Promysl., No. 1, 26–30 (2009).
3. M. A. Mislyuk, I. J. Ribchich, and R. S. Yaremiichuk, Well Drilling, Vol. 3. Vertical and Slant Drilling [in Ukrainian], Interpres Ltd., Kyiv (2004).
4. A. V. Pogorelov, Differential Geometry, Groningen, Noordhoff (1967).
5. B. S. Aadnoy and K. Andersen, “Design of oil wells using analytical friction models,” J. Petrol. Sci. Eng., 32, No. 1, 53–71 (2001).