@article{markenzon_abreu_lee_2013,  title={Some results about the connectivity of trees},  volume={33},  ISSN={0101-7438},  url={https://doi.org/10.1590/S0101-74382013000100008},  DOI={10.1590/S0101-74382013000100008},  number={1},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Markenzon, Lilian and Abreu, Nair Maria Maia de and Lee, Luciana},  year={2013},  month={Jan},  pages={123–132} }