"Small Caliber Lethality" - Article in Infantry Magazine
"Small Caliber Lethality: 5.56mm Performance in Close Quarters Battle"
It's presented by Major Glenn Dean and Major David LaFontaine.
I've read it a couple times over, and while I find the description of wounding mechanics to be consistent with what I have learned of terminal ballistics, I still have a couple concerns about the data ultimately presented. Still, the article has a lot of good going for it and I encourage everyone to read the article when you have the chance (it's 7 pages) and draw their own conclusions. I will refrain from adding my own commentary just yet.
-B