@article {Qi10,
   author = {Zhang, Qi and Cheng, Lu and Boutaba, Raouf},
   affiliation = {University of Waterloo Waterloo Ontario Canada N2L 3G1},
   title = {Cloud computing: state-of-the-art and research challenges},
   journal = {Journal of Internet Services and Applications},
   publisher = {Springer London},
   pages = {7-18},
   volume = {1},
   issue = {1},
   month{May},    
  year = {2010}
}