On May 4, 2013, at 7:39 AM, Davi Carvalho wrote:

> I would like to know any library that I can use to transform a GP Individual (tree representation) in a PNG file.

I'm not sure what you mean, nor why you'd want a bitmap.  But if you're talking about a nice drawing of the tree, try outputting in dot format (Section

> Other question is how do I cite ECJ on my work?

I'd use: 

        author={Sean Luke},
  title = {{ECJ 21: An Evolutionary Computation Library in Java}},
  howpublished = "\url{\(\sim\)eclab/projects/ecj/}",
  year = {2013}