@article{gross_pintão_hessel_1999,  title={Field - free and field - stimulated electron emission from solids},  volume={29},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97331999000200005},  DOI={10.1590/S0103-97331999000200005},  number={2},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Gross, Bernhard and Pintão, Carlos A.F. and Hessel, Roberto},  year={1999},  month={Jun},  pages={229–232} }