Update app.py

app.py

@@ -152,7 +152,7 @@ def main():
                             st.markdown(f"**Authors**: {res['authors']}")
                             source = res['source']
                             st.write("**Sources**:")
-                            for url in row['source']:
+                            for url in res['source']:
                                 st.markdown(f"- [{url}]({url}) | [Google Scholar Search](https://scholar.google.com/scholar?q={quote(res['title'])})")
         
             except Exception as e: