@article{rocha jr_2002,  title={Homophonic substitution},  volume={74},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652002000300037},  DOI={10.1590/S0001-37652002000300037},  number={3},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={ROCHA JR, VALDEMAR C.},  year={2002},  month={Sep},  pages={551–551} }