[e2e] Clark paper source

[Lyman Chapin]

>The fate-sharing principle was first enunciated by Clark in the classic
>"Design Philosophy of the DARPA Internet Protocols", which alas does not seem
>to be available online.

Noel,

It's one of the papers we "resurrected" for the 25th anniversary 
issue of SIGCOMM's Computer Communication Review - 
http://www.acm.org/sigcomm/ccr/archive/1995/jan95/ccr-9501-clark.pdf

- Lyman