1. The 9th dimacs implementation challenge - shortest paths. http://www.dis.uniroma1.it/challenge9/. The 9th dimacs implementation challenge - shortest paths. http://www.dis.uniroma1.it/challenge9/.
2. The Apache Giraph Project. http://giraph.apache.org/. The Apache Giraph Project. http://giraph.apache.org/.
3. The Apache Hama Project. http://hama.apache.org/. The Apache Hama Project. http://hama.apache.org/.
4. Laboratory for web algorithmics. http://law.di.unimi.it/. Laboratory for web algorithmics. http://law.di.unimi.it/.
5. Large-Scale Parallel Collaborative Filtering for the Netflix Prize