1. A. V. Bitsadze, Equations of Mathematical Physics (Nauka, Moscow, 1982) [in Russian].
2. H. Begehr, “Biharmonic Green functions,” Matematiche (Catania) 61 (2), 395–409 (2006).
3. T. Sh. Kal’menov, B. D. Koshanov, and M. Yu. Nemchenko, “Green function representation for the Dirichlet problem of the polyharmonic equation in a sphere,” Complex Var. Elliptic Equ. 53 (2), 177–183 (2008).
4. T. Sh. Kal’menov and D. Suragan, “On a new method for constructing the Green function of the Dirichlet problem for the polyharmonic equation,” Differ. Uravn. 48 (3), 435–438 (2012).
5. T. Sh. Kal’menov and D. Suragan, Differ. Equ. 48 (3), 441–445 (2012).