@article{markenzon_vernet_pereira_2009,  title={A compact code for k-trees},  volume={29},  ISSN={0101-7438},  url={https://doi.org/10.1590/S0101-74382009000300001},  DOI={10.1590/S0101-74382009000300001},  number={3},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Markenzon, Lilian and Vernet, Oswaldo and Pereira, Paulo Renato da Costa},  year={2009},  month={Sep},  pages={493–502} }