Update README.md

README.md

@@ -107,4 +107,13 @@ If you use PP2-M, please cite our work:
   year    = {2025},
   journal = {arXiv preprint arXiv:xxxx.xxxxx}
 }
+```
+---
+
+## 📊  References
+
+[1] Dubey, A., Naik, N., Parikh, D., Raskar, R., and Hidalgo, C. A. (2016). Deep learning the city: Quantifying urban perception at a global scale. In ECCV, pp. 196–212.<br>
+[2] Drusch, M., Del Bello, U., Carlier, S., Colin, O., Fernandez, V., Gascon, F., ... Bargellini, P. (2012). Sentinel-2: ESA’s optical high-resolution mission for GMES operational services. Remote Sensing of Environment, 120:25–36.<br>
+[3] OpenStreetMap contributors (2017). Planet dump retrieved from https://planet.osm.org<br>
+