@article{kiralj_ferreira_2009,  title={Basic validation procedures for regression models in QSAR and QSPR studies: theory and application},  volume={20},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532009000400021},  DOI={10.1590/S0103-50532009000400021},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Kiralj, Rudolf and Ferreira, Márcia M. C.},  year={2009},  pages={770–787} }