Different verions of UNIX, info request.

[Bosse Sandholm]

I got a question from another division of our company:
They want to know what differenses there is between different versions
of UNIX (4.2BSD, 4.1BSD, SYS V, XENIX ...). 
They dont want newspaper articles, tutorial books. 
They need something more exact. They are going to chose a UNIX to implement 
on a computersystem that is going to be sold in SWEDEN.

can you help please send pointers to me.

bosse at erix.UUCP
..!mcvax!enea!erix!bosse