Eriksson, S.-L. and Orelma, H. 2011. A mean-value theorem for some eigenfunctions of the Laplace-Beltrami operator on the upper-half space. Annales Fennici Mathematici. 36, 1 (Feb. 2011), 101–110. DOI:https://doi.org/10.5186/aasfm.2011.3606.