Update README.md

README.md

@@ -3,7 +3,7 @@ license: mit
 title: Human voice to Robot voice
 python_version: 3.11
 sdk: gradio
-sdk_version: 5.4.0
+sdk_version: 5.5.0
 app_file: app.py
 emoji: 👀
 colorFrom: blue
@@ -13,7 +13,9 @@ short_description: This project builds upon work of Neil Lakin/robot_voice.
 
 # Robot Voice with Enhanced Features
 
-This project builds upon the excellent work of [Neil Lakin](https://github.com/nrlakin) on his **robot_voice** project, adding several exciting new features:
+- This project is based on the paper "A Simple Digital Model of the Diode-Based Ring-Modulator," which can be found at http://recherche.ircam.fr/pub/dafx11/Papers/66_e.pdf.
+
+- This project builds upon the excellent work of [Neil Lakin - robot_voice](https://github.com/nrlakin/robot_voice) on his **robot_voice** project, adding several exciting new features:
 
 ## **Get Started:**