@misc {IOPORT.70891058,
    author       = {Johnston, Scott F.},
    title        = {Lumo: illumination for cel animation},
    howpublished = {NPAR, 45-52 (2002).},
    year         = {2002},
    doi          = {10.1145/508530.508538},
    identifier   = {70891058},
}