1. Vaquero, L.M., Rodero-Merino, L., Caceres, J., Lindner, M.: A break in the clouds: towards a cloud definition. ACM SIGCOMM Computer Communication Review 39, 50–55 (2009)
2. CSC cloud usage index,
http://www.csc.com/
3. Microsoft SkyDrive cloud storage platform,
https://skydrive.live.com
4. Amazon S3 service level agreement,
http://aws.amazon.com/s3-sla/
5. Bialecki, A., Cafarella, M., Cutting, D.: O’MALLEY: Hadoop: a framework for running applications on large clusters built of commodity hardware (2005), Wiki at
http://lucene.apache.org/hadoop