Update README.md

README.md

@@ -71,7 +71,7 @@ Note: you may collect and use your own relevant context. Our context may not be
 
 ## Licences
 
-We extracted repositories with permissive license (we used the most popular permissive licenses~\cite{vendome2017license} --- MIT, Apache-2.0, BSD-3-Clause, and BSD-2-Clause). 
+We extracted repositories with permissive license (we used the most popular permissive licenses --- MIT, Apache-2.0, BSD-3-Clause, and BSD-2-Clause). 
 The data points could be removed upon request
 
 ## Metric