The-clock-synchronization-problem.md

@@ -21,3 +21,6 @@ with ![f9](http://chart.apis.google.com/chart?cht=tx&chl=%5Cfrac%7Bdt\_%7Bb,r%7D
 ![f10](http://chart.apis.google.com/chart?cht=tx&chl=%5Cfrac%7Bdt\_%7Bb,s%7D%7D%7Bdt%7D) is controlled and considered insignificant for the measurements.
 
 Therefore, the localisation problem has 4 unknown parameters : the speed following the 3 axis of the reference frame, and the clock drift of the receptor. The question that arises is: **how to make sure those clocks are synchronized?**
+
+Sources :
+Calero, D., & Fernandez, E., & Parés, E. (2016) Positioning performance of Chip-Scale Atomic Clock GNSS augmentation systems. [https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7849326](https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7849326)
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