Update README.md

README.md

@@ -25,3 +25,12 @@ Phenom has been designed to require minimal knowledge of the XFEL process prior
 
 More details on generating these pulses can be found in the [documentation](https://twguest.github.io/phenom).
 
+## Citations
+The use of this package and the methods applied therein should be acknowledged using the following citation:
+- Guest, T. W., R. Bean, R. Kammering, G. van Riessen, A. P. Mancuso, and B. Abbey. “A Phenomenological Model of the X-Ray Pulse Statistics of a High-Repetition-Rate X-Ray Free-Electron Laser.” IUCrJ 10, no. 6 (November 1, 2023). https://doi.org/10.1107/S2052252523008242.
+
+## Cited By:
+Below is a list of research which have acknowledged the application of this model
+[1] E, Juncheng, Carsten Fortmann-Grote, Trey Guest, Egor Sobolev, Luca Gelisio, Richard Bean, and Adrian P. Mancuso. “SimEx-Lite: Easy Access to Start-to-End Simulation for Experiments at Advanced Light Sources.” In Advances in Computational Methods for X-Ray Optics VI, edited by Oleg Chubar and Takashi Tanaka, 22. San Diego, United States: SPIE, 2023. https://doi.org/10.1117/12.2677299.
+
+