Update app.py

app.py

@@ -174,7 +174,7 @@ class Reference(object):
     def bibtex(self):
         """BibTex string of the reference."""
 
-        self.new_id = self.authors[0].split(' ')[1].lower()+self.year+self.title.split(' ')[0].lower()
+        self.new_id = self.authors[0].split(' ')[-1].lower()+self.year+self.title.split(' ')[0].lower()
 
         lines = ["@article{" + self.new_id]
         for k, v in [("Author", " and ".join(self.authors)),