@article{carmo_hönnicke_2021,  title={Fractal dimension analysis with popcorn grains and popped popcorn grains},  volume={43},  ISSN={1806-1117},  url={https://doi.org/10.1590/1806-9126-RBEF-2021-0115},  DOI={10.1590/1806-9126-RBEF-2021-0115},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Carmo, Eduardo do and Hönnicke, Marcelo Goncalves},  year={2021},  pages={e20210115} }