add ref to paper

app.py

@@ -112,6 +112,7 @@ demo = gr.Interface(
         "Upload an MP3/MP4 or provide a YouTube URL. "
         "If you want to predict the difficulty directly from youtube, export your YouTube cookies as a Netscape-format file "
         "and upload it here. Then the app can download and process the audio."
+        "Related publication: [IEEE TASLP paper](https://ieeexplore.ieee.org/document/10878288)"
     )
 )