@article{dickman_muñoz_vespignani_zapperi_2000,  title={Paths to self-organized criticality},  volume={30},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332000000100004},  DOI={10.1590/S0103-97332000000100004},  number={1},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Dickman, Ronald and Muñoz, Miguel A. and Vespignani, Alessandro and Zapperi, Stefano},  year={2000},  month={Mar},  pages={27–41} }