abstract = "describes Derivation Tree Based Genetic Programming.
after introducing the problem domain in this section,
the relevant subjects from the field of evolutionary
algorithms and formal grammars are summarised. Section
4 describes the DTGP method, whereas Section 5 provides
a summary of some extensions of the base method, like
introducing semantic constraints. Section 6 gives an
overview of the results regarding several applications
of DTGP, and Section 7 lists the major findings of the
thesis.",