@inbook{Vanneschi_2003,
title={Difficulty of Unimodal and Multimodal Landscapes in Genetic Programming},
ISBN={9783540451105},
ISSN={0302-9743},
url={http://dx.doi.org/10.1007/3-540-45110-2_70},
DOI={10.1007/3-540-45110-2_70},
booktitle={Lecture Notes in Computer Science},
publisher={Springer Berlin Heidelberg},
author={Vanneschi,
Leonardo and Tomassini,
Marco and Clergue,
Manuel and Collard,
Philippe},
year={2003},
pages={1788–1799} }