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Krzempek, Karol, Arkadiusz Hudzikowski, Aleksander Głuszek, Grzegorz Dudzik, Krzysztof Abramski, Gerard Wysocki, and Michał Nikodem. (2018) 2018. “Multi-Pass Cell-Assisted Photoacoustic Photothermal Spectroscopy of Gases Using Quantum Cascade Laser Excitation and Heterodyne Interferometric Signal Detection”. Applied Physics B 124: 74. Publisher’s Version: Multi-pass cell-assisted photoacoustic/photothermal spectroscopy of gases using quantum cascade laser excitation and heterodyne interferometric signal detection.