@conference {MKK11, title = {FCM: an Architecture for Integrating {IaaS} Cloud Systems}, booktitle = {proc. of the Second International Conference on Cloud Computing, GRIDs, and Virtualization (Cloud Computing 2011)}, year = {2011}, pages = {7-12}, author = {A. Cs. Marosi and G. Kecskem{\'e}ti and Attila Kert{\'e}sz and P. Kacsuk} }