Update README.md

README.md

@@ -57,6 +57,17 @@ Make sure you have the following packages installed:
 - matplotlib
 
 
+## Primary References
+
+- H. Shah-Mansouri and V. W. Wong, “[Hierarchical fog-cloud computing for iot systems: A computation offloading game](https://ieeexplore.ieee.org/document/8360511)", IEEE Internet of Things Journal, May 2018.
+
+- M. Tang and V. W. Wong, "[Deep reinforcement learning for task offloading in mobile edge computing systems](https://ieeexplore.ieee.org/abstract/document/9253665)", IEEE Transactions on Mobile Computing, Nov 2020.
+
+- H. Zhou, K. Jiang, X. Liu, X. Li, and V. C. Leung, “[Deep reinforcement learning for energy-efficient computation offloading in mobile-edge computing](https://ieeexplore.ieee.org/document/9462445)”, IEEE Internet of Things Journal, Jun 2021.
+
+- L. Yang, H. Zhang, X. Li, H. Ji, and V. C. Leung, “[A distributed computation offloading strategy in small-cell networks integrated with mobile edge computing](https://ieeexplore.ieee.org/document/8519737)”, IEEE/ACM Transactions on Networking, Dec 2018.
+
+
 ## Contribute
 If you have an issue or found a bug, please raise a GitHub issue [here](https://github.com/ImanRht/QOCO/issues). Pull requests are also welcome.