@article{calamoneri_petreschi_2001,  title={Edge-clique graphs and the lambda-coloring problem},  volume={7},  ISSN={0104-6500},  url={https://doi.org/10.1590/S0104-65002001000200006},  DOI={10.1590/S0104-65002001000200006},  number={3},  journal={Journal of the Brazilian Computer Society},  publisher={Sociedade Brasileira de Computação},  author={Calamoneri, Tiziana and Petreschi, Rossella},  year={2001},  pages={38–47} }