Update README.md

Author: dou-du

README.md

@@ -63,6 +63,16 @@ If the `widget test` passes but the `screenshot comparison` fails, it indicates
 is different from the previous version. In this case, you'll need to manually download the artifact from 
 the `widget test` and use it to replace the `widget-sample.png` figure in the `test` folder.
 
+## How to cite
+
+When using the content of this repository, please cite the following two articles:
+
+1. D. Du, T. J. Baird, S. Bonella and G. Pizzi, OSSCAR, an open platform for collaborative development of computational tools for education in science, *Computer Physics Communications*, **282**, 108546 (2023).
+https://doi.org/10.1016/j.cpc.2022.108546
+
+2. D. Du, T. J. Baird, K. Eimre, S. Bonella, G. Pizzi, Jupyter widgets and extensions for education and research in computational physics and chemistry, *Computer Physics Communications*, **305**, 109353 (2024).
+https://doi.org/10.1016/j.cpc.2024.109353
+
 ## Acknowledgements
 
 We acknowledge support from the EPFL Open Science Fund via the [OSSCAR project](http://www.osscar.org/).