From: utzoo!decvax!cca!DFC@MIT-MC@sri-unix
Newsgroups: net.unix-wizards
Title: Wanted: Function Cross Referencer for C
Article-I.D.: sri-unix.2388
Posted: Sun Aug  1 20:06:15 1982
Received: Mon Aug  2 03:42:07 1982

From: Daniel F Chernikoff 
Date: 1 July 1982 11:38-EDT
David Tillbrook (of "TIPS" and "ANGUS" fame) wrote a program called
"calls", that produces an indented listing of who-calls-who in a C
program.  If no one else has one, I'll see if I can dig it up for you
(I have it on a tape somewhere).