Fix hyperlink

README.md

 # MPI-BugBench
-MPI-BugBench [[MBB24](#References)] is an benchmark suite to evaluate the classification quality of MPI correctness tools. It covers various error classes in MPI while incorporating a broad range of real-world MPI usage scenarios.
+MPI-BugBench [[MBB24](#references)] is an benchmark suite to evaluate the classification quality of MPI correctness tools. It covers various error classes in MPI while incorporating a broad range of real-world MPI usage scenarios.
 
 
 ## Preparation
@@ -13,7 +13,7 @@ docker run -v `pwd`:/MBB -it mbb:latest bash
 ```
 
 ## Generating the codes
-MBB uses a generation infrastructure written in Python to generate all test codes and supports different test generation levels (for details, see our [paper](#References)).
+MBB uses a generation infrastructure written in Python to generate all test codes and supports different test generation levels (for details, see our [paper](#references)).
 To generate the test cases for a given generation level (1-5) run the following commands:
 ```
 python3 MBB.py -c generate --level 2