Update README.md

README.md

@@ -54,4 +54,15 @@ sf.write("audio_before.wav", audio_before, 22050, "PCM_16")
 sf.write("audio_after.wav", audio_after, 22050, "PCM_16")
 
 ipd.Audio('audio_after.wav')
+```
+##### Referencing FastSpeech2
+```
+@misc{ren2021fastspeech,
+      title={FastSpeech 2: Fast and High-Quality End-to-End Text to Speech}, 
+      author={Yi Ren and Chenxu Hu and Xu Tan and Tao Qin and Sheng Zhao and Zhou Zhao and Tie-Yan Liu},
+      year={2021},
+      eprint={2006.04558},
+      archivePrefix={arXiv},
+      primaryClass={eess.AS}
+}
 ```