| http://www.w3.org/ns/prov#value | - A laser source, for example, can be a gas laser, e.g. a HeNe, stabilized in any of a variety of conventional techniques known to those skilled in the art, see for example, T. Baer et al., ???Frequency Stabilization of a 0.633 ??m He???Ne-longitudinal Zeeman Laser, ??? Applied Optics, 19, 3173-3177 (1980); Burgwald et al., U.S. Pat. No. 3,889,207, issued Jun. 10, 1975; and Sandstrom et al., U.S. Pa
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