@article{pereira_monico_camargo_2021,  title={ESTIMATION AND ANALYSIS OF PROTECTION LEVELS FOR PRECISE APPROACH AT RIO DE JANEIRO INTERNATIONAL AIRPORT USING REAL TIME σ<sub>VIG</sub> FOR EACH GPS AND GLONASS SATELLITE},  volume={27},  ISSN={1982-2170},  url={https://doi.org/10.1590/s1982-21702021000s00010},  DOI={10.1590/s1982-21702021000s00010},  number={spe},  journal={Boletim de Ciências Geodésicas},  publisher={Universidade Federal do Paraná},  author={Pereira, Vinícius Amadeu Stuani and Monico, João Francisco Galera and Camargo, Paulo de Oliveira},  year={2021},  pages={e2021010} }