1. M. Bramanti. Potential theory for stationary Schrödinger operators: A Survey of results obtained with non probabilistic methods. LE MATEMATICHE, 47, pp. 25–61, 1992.
2. A. Kheyfits. Dirichlet problem for the Schrödinger operator in a half-space with boundary data of arbitrary growth at infinity. Differential and Integral Equations, 10, pp. 153–164, 1997.
3. B. Ya. Levin. Distribution of Zeros of Entire Functions, AMS Translations of Mathematical Monographs, Vol. 5, Providence, RI, 1964.
4. F.-Y. Maeda. On regularity of boundary points for Dirichlet problems of the equation Δu = qu(q ≥ 0) Hiroshima Math. J., 1, pp. 373–404, 1971.
5. P. McCoy. Sampling theorems associated with boundary value problems for elliptic partial differential equations in R“, Complex Variables. 23, pp. 269–281, 1993.