@article{faria_pinto_pedroza_2017,  title={
          <b>Optimal Check Digit Systems Based on Modular Arithmetic</b>
          },  volume={18},  ISSN={2179-8451},  url={https://doi.org/10.5540/tema.2017.018.01.0105},  DOI={10.5540/tema.2017.018.01.0105},  number={1},  journal={TEMA (São Carlos)},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={FARIA, L. and PINTO, P.E.D. and PEDROZA, N.},  year={2017},  month={Jan},  pages={105–125} }