Added citation

README.md

@@ -93,6 +93,20 @@ For a full instruction manual of the configuration files, see [configuration](./
 - ForestFactory: [https://git.ufz.de/angermue/forestfactory](https://git.ufz.de/angermue/forestfactory) 
 - Helios++: [https://github.com/3dgeo-heidelberg/helios](https://github.com/3dgeo-heidelberg/helios)
 
-# 4. Contacts
+# 4. Citation
 
-If there are any issues or questions, feel free to contact me: [adoosth@gwdg.de](mailto:adoosth@gwdg.de)
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+If you used this tool in your research, please cite as follows:
+
+```
+@conference{synforest2023,
+    title        = {Large-Scale Synthetic Forest Point Cloud Generation on HPC Systems},
+    author       = {Ali Doosthosseini and Hauke Kirchner and Dorothea Sommer and Julian Kunkel},
+    year         = 2023,
+    month        = {September},
+    organization = {NHR Conference '23}
+}
+```
+
+# 5. Contacts
+
+If there are any issues or questions, feel free to contact Ali [adoosth@gwdg.de](mailto:adoosth@gwdg.de) or Hauke [hgronen@gwdg.de](mailto:hauke.kirchner@gwdg.de)
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