Kwaśniak, Dawid Łukasz, and Sławomir Cellmer. “Incorporating Inter-System Bias in Single Point Positioning Based on GPS, Galileo and BeiDou System”. Geomatics and Environmental Engineering 15, no. 1 (February 4, 2021): 97–109. Accessed October 24, 2025. https://www.gaee.agh.edu.pl/gaee/article/view/75.