1. Negatively curved manifolds, elliptic operators, and the Martin boundary;Ancona;Ann. of Math.,1987
2. Classical Potential Theory;Armitage,2001
3. The Lusin area function and local admissible convergence of harmonic functions on homogeneous trees;Atanasi;Trans. Amer. Math. Soc.,2008
4. The Geometry of Discrete Groups, Graduate Texts in Mathematics, vol. 91;Beardon,1983
5. Eine erweiterung des satzes von vitali über folgen analytischer funktionen;Blaschke;Berichte Math.-Phys. Kl., Sächs. Gesell. der Wiss. Leipzig,1915