1. Apache hadoop. https://hadoop.apache.org/. Accessed: 2014--10--14. Apache hadoop. https://hadoop.apache.org/. Accessed: 2014--10--14.
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3. OpenRefine (formerly google refine). http://openrefine.org/. Accessed: 2014--10--14. OpenRefine (formerly google refine). http://openrefine.org/. Accessed: 2014--10--14.
4. Spark SQL