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The work would be possible without efforts made by many people to build knowledge of GSM.
-The most important ancestor of *gr-gsm* (and *gsm-receiver* of *Airprobe* project) was *gsm-tvoid*.
+The most important ancestor of *gr-gsm* (and *gsm-receiver* of *Airprobe* project) was *gsm-tvoid* written by Tvoid.
*Gr-gsm* wouldn't be also possible without help and inspiration by Harald Welte, Dieter Spaar and Sylvain Munaut.