Add few papers to SEE ALSO. Particularly the first one demonstrates

the diminishing value of P-states compared to C-states on new CPUs.

share/man/man4/acpicpu.4

@@ -1,4 +1,4 @@
-.\" $NetBSD: acpicpu.4,v 1.31 2011/04/09 17:25:28 jruoho Exp $
+.\" $NetBSD: acpicpu.4,v 1.32 2011/08/09 07:09:33 jruoho Exp $
 .\"
 .\" Copyright (c) 2010 Jukka Ruohonen <jruohonen@iki.fi>
 .\" All rights reserved.
@@ -24,7 +24,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd April 9, 2011
+.Dd August 6, 2011
 .Dt ACPICPU 4
 .Os
 .Sh NAME
@@ -294,6 +294,30 @@ flag).
 .Xr odcm 4 ,
 .Xr powernow 4 ,
 .Xr cpu_idle 9
+.Rs
+.%A Etienne Le Sueur
+.%A Gernot Heiser
+.%T Dynamic Voltage and Frequency Scaling: The Laws of Diminishing Returns
+.%O Proceedings of the 2010 Workshop on \
+Power Aware Computing and Systems (HotPower'10)
+.%D October, 2010
+.%U http://www.ertos.nicta.com.au/publications/papers/LeSueur_Heiser_10.pdf
+.Re
+.Rs
+.%A Microsoft Corporation
+.%T Windows Native Processor Performance Control
+.%N Version 1.1a
+.%D November, 2002
+.%U http://msdn.microsoft.com/en-us/windows/hardware/gg463343
+.Re
+.Rs
+.%A Venkatesh Pallipadi
+.%A Alexey Starikovskiy
+.%T The Ondemand Governor. Past, Present, and Future
+.%I Intel Open Source Technology Center
+.%O Proceedings of the Linux Symposium
+.%U http://www.kernel.org/doc/ols/2006/ols2006v2-pages-223-238.pdf
+.Re
 .Sh HISTORY
 The
 .Nm
@@ -323,7 +347,7 @@ This is neither handled by
 .Nm
 nor by
 .Xr est 4
-and
+or
 .Xr powernow 4 .
 .It
 There is currently neither a well-defined, machine-independent