Kealy, A., Retscher, G., Toth, C., Hasnur-Rabiain, A., Gikas, V., Grejner-Brzezinska, D., …Moore, T. (2016). Collaborative navigation as a solution for PNT applications in GNSS challenged environments: report on field trials of a joint FIG / IAG working group. Journal of Applied Geodesy, 9(4), 244-263. https://doi.org/10.1515/jag-2015-0014