Title:   On universally stable elements
Authors: Ian J. Leary
	 Bj"orn Schuster
	 Nobuaki Yagita
Status:  Quart. J. Math. Oxford Ser. (2) 48 (1997), 493-498.
	 MR 99b:2008

Abstract:
We show that certain subrings of the cohomology of a finite p-group P
may be realised as the images of restriction from suitable virtually 
free groups.  We deduce that the cohomology of P is a finite module 
for any such subring. Examples include the ring of 'universally stable 
elements' defined by Evens and Priddy, and rings of invariants such as 
the mod-2 Dickson algebras.