@article{perotoni_santos_2021,  title={SDR-Based Spectrum Analyzer Based in Open-Source GNU Radio},  volume={20},  ISSN={2179-1074},  url={https://doi.org/10.1590/2179-10742021v20i31194},  DOI={10.1590/2179-10742021v20i31194},  number={3},  journal={Journal of Microwaves, Optoelectronics and Electromagnetic Applications},  publisher={Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo},  author={Perotoni, Marcelo B. and Santos, Kenedy M. G. dos},  year={2021},  month={Sep},  pages={542–555} }