References

   [1]  Postel, J. (ed.), "Internet Protocol - DARPA Internet Program
         Protocol Specification," RFC 791, USC/Information Sciences
         Institute, September 1981.

   [2]   Cerf, V., "The Catenet Model for Internetworking," IEN 48,
         Information Processing Techniques Office, Defense Advanced
         Research Projects Agency, July 1978.

   [3]   Strazisar, V., "Gateway Routing:  An Implementation
         Specification", IEN 30, Bolt Beranek and Newman, April 1979.

   [4]   Strazisar, V., "How to Build a Gateway", IEN 109, Bolt Beranek
         and Newman, August 1979.

   [5]   Mills, D., "DCNET Internet Clock Service," RFC 778, COMSAT
         Laboratories, April 1981.