Update app.py

app.py

@@ -328,7 +328,7 @@ if __name__ == '__main__':
 
 **We are looking for collaborators! Collaborator를 찾고 있습니다!** 🇬🇧 🇪🇸 🇰🇷 🇫🇷 🇷🇴 🇩🇪 🇨🇳
 
-**Please check our github project: https://github.com/mv-lab/swin2sr and feel free to contact us**
+**Please check our github project: https://github.com/mv-lab/swin2sr or paper: https://arxiv.org/abs/2209.11345 feel free to contact us**
 
 **Demos also available at [google colab](https://colab.research.google.com/drive/1paPrt62ydwLv2U2eZqfcFsePI4X4WRR1?usp=sharing) and [Kaggle](https://www.kaggle.com/code/jesucristo/super-resolution-demo-swin2sr-official/)**
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