@article{diambra_1998,  title={Two approximations to learning from examples},  volume={28},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331998000400020},  DOI={10.1590/S0103-97331998000400020},  number={4},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Diambra, L.},  year={1998},  month={Dec},  pages={453–461} }