@Incollection{ellson2004graphviz,
  author = {Ellson, J. and Gansner, E.R. and Koutsofios, E. and North, S.C. and Woodhull, G.},
  title  = {Graphviz and Dynagraph -- Static and Dynamic Graph Drawing Tools},

  year   = {2004},
  number = {},
  url    = {http://www.springer.com/math/cse/book/978-3-540-00881-1},

  const  = {\ text}
}