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Stumbled over this book in Google scholar investigating transmission line theory. Middle section contains a lot of math analyzing nested concentric-conductor coax configurations. Dispersion (talk) 01:35, 26 August 2008 (UTC)
I'm inclined to add that this term - though common - is a misnomer when used to describe three-conductor coaxial cable. "Tri-axial" implies three axes (similar to "twin-axial"), and would be better applied to three core mains lead or similar.