1. Bitsadze, A.V., Some Properties of Polyharmonic Functions, Differ. Uravn., 1988, vol. 24, no. 5, pp. 825–831.
2. Karachik, V.V., Turmetov, B.Kh., and Bekaeva, A., Solvability Conditions of the Neumann Boundary Value Problem for the Biharmonic Equation in the Unit Ball, Int. J. Pure Appl. Math., 2012, vol. 81, no. 3, pp. 487–495.
3. Karachik, V.V., A Problem for the Polyharmonic Equation in a Ball, Sibirsk. Mat. Zh., 1991, vol. 32, no. 5, pp. 51–58.
4. Bitsadze, A.V., Uravneniya matematicheskoi fiziki (Equations of Mathematical Physics), Moscow: Nauka, 1976.
5. Bondarenko, B.A.,Generalized Pascal Triangles and Pyramids: Their Fractals, Graphs and Applications, Bollinger, R.S., Ed., Santa Clara, 1993.