@article{ávila_menon_2007,  title={From integral to derivative dispersion relations},  volume={37},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332007000400035},  DOI={10.1590/S0103-97332007000400035},  number={2b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Ávila, R. F. and Menon, M. J.},  year={2007},  month={Jul},  pages={661–664} }