1. OpenStack web site, http://www.openstack.org/
2. Y. Yamato, N. Shigematsu and N. Miura, "Evaluation of Agile Software Development Method for Carrier Cloud Service Platform Development," IEICE Transactions on Information and Systems, Vol.E97-D, No.11, pp.2959-2962, Nov. 2014.
3. Y. Yamato, "Automatic verification technology of software patches for user virtual environments on IaaS cloud," Springer Journal of Cloud Computing 2015, 4:4, DOI: 10.1186/s13677-015-0028-6, Feb. 2015.
4. Nimble CASL architecture web site, http://www.nimblestorage.com/products/architecture.php
5. S. A. Weil, S. A. Brandt, E. L. Miller, D. D. E. Long and C. Maltzahn, "Ceph: a scalable, high-performance distributed file system," Proceedings of the 7th symposium on Operating systems design and implementation (OSDI'06), pp. 307-320, 2006.