Added suggested citing in the end of readme

README.md

@@ -65,3 +65,45 @@ python3 -m pip install -e .
 ## Examples
 
 PET needs to be setup with a configuration file. See the example folder for inspiration.the
+
+## Suggested readings:
+
+If you use PET in a scientific publication, we would appreciate it if you cited one of the first papers where the PET was introduced. Each of them describes some of the PET's functionalities:
+
+### Bayesian data assimilation with EnRML and ES-MDA for History-Matching Workflow with AI-Geomodeling
+#### Cite as
+Fossum, Kristian, Sergey Alyaev, and Ahmed H. Elsheikh. "Ensemble history-matching workflow using interpretable SPADE-GAN geomodel." First Break 42.2 (2024): 57-63. https://doi.org/10.3997/1365-2397.fb2024014
+
+```
+@article{fossum2024ensemble,
+  title={Ensemble history-matching workflow using interpretable SPADE-GAN geomodel},
+  author={Fossum, Kristian and Alyaev, Sergey and Elsheikh, Ahmed H},
+  journal={First Break},
+  volume={42},
+  number={2},
+  pages={57--63},
+  year={2024},
+  publisher={European Association of Geoscientists \& Engineers},
+  url = {https://doi.org/10.3997/1365-2397.fb2024014}
+}
+```
+
+###  Bayesian inversion technique, localization, and data compression for history matching of the Edvard Grieg field using 4D seismic data
+#### Cite as
+
+Lorentzen, R.J., Bhakta, T., Fossum, K. et al. Ensemble-based history matching of the Edvard Grieg field using 4D seismic data. Comput Geosci 28, 129–156 (2024). https://doi.org/10.1007/s10596-024-10275-0
+
+
+```
+@article{lorentzen2024ensemble,
+  title={Ensemble-based history matching of the Edvard Grieg field using 4D seismic data},
+  author={Lorentzen, Rolf J and Bhakta, Tuhin and Fossum, Kristian and Haugen, Jon Andr{\'e} and Lie, Espen Oen and Ndingwan, Abel Onana and Straith, Knut Richard},
+  journal={Computational Geosciences},
+  volume={28},
+  number={1},
+  pages={129--156},
+  year={2024},
+  publisher={Springer},
+  url={https://doi.org/10.1007/s10596-024-10275-0}
+}
+```