. . . . . "Coherence Length"@en . . "\u03BE" . . . . . . . . . . . . . . . . . . "\"Coherence Length\" characterizes the distance in a superconductor over which the effect of a perturbation is appreciable." . . . . . . . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31897"^^ . . . . . . . "http://en.wikipedia.org/wiki/Coherence_length"^^ . . .