1. Amazon EC2 and RDS service disruption on April 21st 2011. http://aws.amazon.com/message/65648. Amazon EC2 and RDS service disruption on April 21st 2011. http://aws.amazon.com/message/65648.
2. ANTLR tool. http://www.antlr.org. ANTLR tool. http://www.antlr.org.
3. Apache CloudStack. http://cloudstack.apache.org. Apache CloudStack. http://cloudstack.apache.org.
4. AWS service outage on December 24th 2012. http://aws.amazon.com/message/680587. AWS service outage on December 24th 2012. http://aws.amazon.com/message/680587.
5. AWS service outage on October 22nd 2012. https://aws.amazon.com/message/680342. AWS service outage on October 22nd 2012. https://aws.amazon.com/message/680342.