@article{alcaraz_bariev_2000,  title={Exact solution of asymmetric diffusion with N classes of particles of arbitrary size and hierarchical order},  volume={30},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332000000400004},  DOI={10.1590/S0103-97332000000400004},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Alcaraz, F. C. and Bariev, R. Z.},  year={2000},  month={Dec},  pages={655–666} }