@Book {zl-icdke2011,
    editor = {J. Zhang and G. Livraga},
    booktitle = {Proc. of the 2011 International Conference on Data and Knowledge Engineering (ICDKE 2011)},
    publisher = {IEEE},
    address = {Milan, Italy},
    month = {September},
    day = {6},
    year = {2011}
}