1. Forrest Warthman, Delay-Tolerant Networks (DTNs): a Tutorial, v 1.1, March 2003.
2. Joe Kasser, Martin Sweeting, Jeff Ward, The UOSAT-Oscar 14 and 15 Spacecraft, The AMSAT Journal, v. 13, no. 2, May 1990, p. 9.
3. http://www.cospas-sarsat.org/
4. http://noaasis.noaa.gov/ARGOS/
5. http://www.orbcomm.com/