Position, Navigation, and Timing (PNT) Through Low Earth Orbit (LEO) Satellites: A Survey on Current Status, Challenges, and Opportunities. - Fabricio dos Santos Prol; Ruben Morales Ferre; Zainab Saleem; Petri Välisuo; Christina Pinell; Elena Simona Lohan; Mahmoud Elsanhoury; Mohammed S. Elmusrati; Saiful Islam; Kaan Çelikbilek; Kannan Selvan; Jaakko Yliaho; et al. (IEEE Access, 2022)