Update app.py

app.py

@@ -84,8 +84,9 @@ def create_bibtex_entry(data):
     if year and 'year' not in data:
         data['year'] = year
 
+    year = data['year']
     author_words = data.get('author', '').split()
-    first_author = author_words[0] if author_words else 'Unknown'
+    first_author = author_words[0] if author_words else 'unknown'
     bibtex_id = f"{first_author}{year}" if year else first_author
     bibtex_id = remove_punctuation(bibtex_id.lower())