Urniezius, R., and V. Siozinys. “Entropic Mapping and Green’s Function Approximation for Electrostatic Field With Dirichlet Boundary Conditions”. Elektronika Ir Elektrotechnika, vol. 19, no. 1, Jan. 2013, pp. 27-30, doi:10.5755/j01.eee.19.1.3249.