Reference:

Kai Puolamäki and Alessio Bertone. Introduction to special issue on visual analytics and knowledge discovery. SIGKDD Explorations, 11(2):3–4, 2009.

Suggested BibTeX entry:

@article{Puolamaki09explorations,
    author = {Kai Puolam\"aki and Alessio Bertone},
    journal = {SIGKDD Explorations},
    number = {2},
    pages = {3--4},
    title = {Introduction to Special Issue on Visual Analytics and Knowledge Discovery},
    volume = {11},
    year = {2009},
}