@article {Boutaba012,
   author = {Boutaba, Raouf and Ng, Walfrey and Leon-Garcia, Alberto},
   title = {Web-Based Customer Management of VPNs},
   journal = {Journal of Network and Systems Management},
   publisher = {Springer New York},
   pages = {67-87},
   volume = {9},
   issue = {1},
   year = {2001}
}