KEM concept.
U.S. Army
1989
<a rel="nofollow" class="external text" href="https://babel.hathitrust.org/cgi/pt?id=uiug.30112105169723;view=1up;seq=36">United States Army Weapon Systems 1989</a>. — Washington, D.C.: U.S. Government Printing Office, 1989. — P. 30.