@article{márdero arellano_2001,  title={Serviços de referência virtual},  volume={30},  ISSN={0100-1965},  url={https://doi.org/10.1590/S0100-19652001000200002},  DOI={10.1590/S0100-19652001000200002},  number={2},  journal={Ciência da Informação},  publisher={IBICT},  author={Márdero Arellano, Miguel Ángel},  year={2001},  month={May},  pages={7–15} }