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Aleksandar D. Rakić, Thomas Taimre, Karl Bertling, Yah Leng Lim, Paul Dean, Dragan Indjin, Zoran Ikonić, Paul Harrison, Alexander Valavanis, Suraj P. Khanna, Mohammad Lachab, Stephen J. Wilson, Edmund H. Linfield, and A. Giles Davies, "Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis," Opt. Express 21, 22194-22205 (2013)