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→References
<ul>
<li>Erich, Gamma. Design Patterns : elements of reusable object-oriented software. Upper Saddle River: Pearson Education Corporate Sales Division, 2000.</li>
<li>"4th Lecture about Design Patterns". Ssamdark's Homepage. March 20, 2007 <http://www.misofruit.co.kr/seojewoo/programming/designpattern4.htm>.
</li>
</ul>
== Links ==
[[BTP600]]
