Robert B. Bohn John Messina Fang Liu Jin Tong Jian Mao NIST Cloud Computing Reference Architecture. 594-596 2011 SERVICES https://doi.org/10.1109/SERVICES.2011.105 https://doi.ieeecomputersociety.org/10.1109/SERVICES.2011.105 conf/services/2011 db/conf/services/services2011.html#BohnMLTM11