<a href="http://ella.slis.indiana.edu/~katy/L579/brandes.pdf">A
            Faster Algorithm for Betweenness Centrality</a></em><br>
Journal of Mathematical Sociology 25 (2):163-177, 2001.

<p></p><dt><a name="freeman77">55</a>
<dd>Lindon C. Freeman<br>
<em>A Set of Measures of Centrality Based on Betweenness</em><br>
Sociometry 40, pp. 35-41, 1977.

<p></p><dt><a name="anthonisse71">56</a>
<dd>J.M. Anthonisse<br>
<em>The rush in a directed graph.</em><br>
Technical Report BN9/71, Stichting Mahtematisch Cen