We show that AdS two-point functions can be obtained by connecting two points in the interior of AdS space with one point on its boundary by a dual pair of Dobrev's boundary-to-bulk intertwiners and integrating over the boundary point.
Cite
@article{arxiv.hep-th/0305235,
title = {The group approach to AdS space propagators},
author = {Thorsten Leonhardt and Ruben Manvelyan and Werner Ruehl},
journal= {arXiv preprint arXiv:hep-th/0305235},
year = {2010}
}