Combinatorica`
Combinatorica`
Girth
As of Version 10, most of the functionality of the Combinatorica package is built into the Wolfram System. »
Girth[g]
gives the length of a shortest cycle in a simple graph 
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Details and Options
- To use Girth, you first need to load the Combinatorica Package using Needs["Combinatorica`"].
Wolfram Research (2012), Girth, Wolfram Language function, https://reference.wolfram.com/language/Combinatorica/ref/Girth.html.
Text
Wolfram Research (2012), Girth, Wolfram Language function, https://reference.wolfram.com/language/Combinatorica/ref/Girth.html.
CMS
Wolfram Language. 2012. "Girth." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/Combinatorica/ref/Girth.html.
APA
Wolfram Language. (2012). Girth. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/Combinatorica/ref/Girth.html