There are two publications that describe the XRTG4 package and extensions:
- A generic x-ray tracing toolbox in Geant4, Proc. SPIE 7360, EUV and X-Ray Optics: Synergy between Laboratory and Space, 73600Z (April 30, 2009)
- X-ray tracing using Geant4, NIMA Volume 599, Issues 2–3, 11 February 2009, Pages 260–263