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M. G. Allen, K. L. Carleton, S. J. Davis, W. J. Kessler, C. E. Otis, D. A. Palombo, and D. M. Sonnenfroh, "Ultrasensitive dual-beam absorption and gain spectroscopy: applications for near-infrared and visible diode laser sensors," Appl. Opt. 34, 3240-3249 (1995)
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