networkx/networkx — pull request #1306 by jfinkels (2014-12-16 00:11:16+00:00)
Title: Adds a generator for the chordal p-cycle graph.

Adds the chordal p-cycle graph, a mildly explicit algebraic construction
of a family of 3-regular expander graphs. Also, moves both the existing
expander graph generator function (for the Margulis-Gabber-Galil
expander) and the new chordal cycle graph function to a new module,
``networkx.generators.expanders``.