1. The DBLP Computer Science Bibliography. http://www.informatik.uni-trier.de/~ley/db/ The DBLP Computer Science Bibliography. http://www.informatik.uni-trier.de/~ley/db/
2. Computing Research and Education. http://core.edu.au/index.php Computing Research and Education. http://core.edu.au/index.php
3. Microsoft Academic Search. http://academic.research.microsoft.com Microsoft Academic Search. http://academic.research.microsoft.com
4. The use of the area under the ROC curve in the evaluation of machine learning algorithms