@book {IOPORT.20008461,
    editor       = {Collomosse, John P. and Asente, Paul and Spencer, Stephen N.},
    title        = {Proceedings of the 9th international symposium on non-photorealistic animation and rendering 2009, Vancouver, BC, Canada, August 5-7, 2011},
    year         = {2011},
    isbn         = {978-1-4503-0907-3},
    publisher    = {ACM},
    identifier   = {20008461},
}