outine.intro.f1" class="para"><sup class="para">[2] </sup></a>
        Knuth, Donald Ervin (1997). "Fundamental Algorithms. The Art of Computer
        Programming 1", (3rd ed.)
      </p></div>
<div id="ftn.coroutine.intro.f2" class="footnote"><p><a href="#coroutine.intro.f2" class="para"><sup class="para">[3] </sup></a>
        Moura, Ana Lucia De and Ierusalimschy, Roberto. "Revisiting coroutines".
        ACM Trans. Program. Lang. Syst., Volume 31 Issue 2, February 2009, Article
        No. 6
      </p>