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A. A. Kosterev, R. F. Curl, F. K. Tittel, C. Gmachl, F. Capasso, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, and A. Y. Cho, "Effective utilization of quantum-cascade distributed-feedback lasers in absorption spectroscopy," Appl. Opt. 39, 4425-4430 (2000)
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