I am currently writing a review as a thesis project and I must cover black holes and wormholes, static and stationary. For black holes I found this lecture where black holes are approached from a more mathematical point of view. However, for wormholes I didn't really find much material (except for this article but I would like to know more). Could you recommend sources that cover wormholes from a more mathematical point of view but without neglecting the physical concepts?