@article{sotomayor_gusev_leite_2004,  title={Evolution from commensurability to size-effects structures in three-dimensional billiards},  volume={34},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332004000400028},  DOI={10.1590/S0103-97332004000400028},  number={2b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Sotomayor, N. M. and Gusev, G. M. and Leite, J. R.},  year={2004},  month={Jun},  pages={638–640} }