@InProceedings{marroquim09,
  author    = {{R}icardo {M}arroquim and
               {A}ndr\'{e} {M}aximo},
  title     = {{I}ntroduction to {GPU} {P}rogramming with {GLSL}},
  journal   = {{T}utorials of the {S}ibgrapi 2009},
  year      = {2009},
  publisher = {IEEE}
}