Stoll, Manfred. “The Reproducing Kernel of $\mathcal H^2$ and Radial Eigenfunctions of the Hyperbolic Laplacian”. MATHEMATICA SCANDINAVICA 124, no. 1 (January 13, 2019): 81-101. Accessed April 18, 2019. https://www.mscand.dk/article/view/109674.