Update README.md

README.md

@@ -6,3 +6,12 @@ Policy Gradient (DDPG) based Energy Harvesting Wireless Communications"
 
 We thank the author MorvanZhou for his DDPG class codes, which is available at:
 https://github.com/MorvanZhou/Reinforcement-learning-with-tensorflow/tree/master/contents/9_Deep_Deterministic_Policy_Gradient_DDPG
+
+
+If you find it useful in your research, please consider citing:
+@article{crqiu_DDPG,
+    Author = {Chengrun Qiu, Yang Hu, Yan Chen, Bing Zeng},
+    Title = {Deep Deterministic Policy Gradient (DDPG) based Energy Harvesting Wireless Communications},
+    Journal = {IEEE Internet of Things Journal},
+    Year = {2019}
+}