1. Dean, J., Ghemawat, S.: MapReduce: simplified data processing on large clusters. In: 6th Symposium on Operating Systems Design & Implementation (OSDI 2004), 6–8 December 2004, San Francisco (2004)
2. http://hadoop.apache.org/
3. Apache Spark.
http://spark.apache.org/
4. VirtualBox.
https://www.VirtualBox.org/
5. Liferay Portal.
https://www.liferay.com