@book{VasileiadouUllrichTamm, author = {Vasileiadou, Eleni Magdalini and Ullrich, Sebastian and Tamm, Gerrit}, title = {Cloud Computing Definitions and Approaches - Levels of Abstraction: IAAS, PAAS, SAAS}, publisher = {Asperado GmbH \& SRH Hochschule Berlin}, language = {en} }