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Hoffmann, S., Peveling, R., Pfau, T., Adamczyk, O., Eickhoff, R., &; Noé, R. (2009). Multiplier-Free Real-Time Phase Tracking for Coherent QPSK Receivers. IEEE PHOTONICS TECHNOLOGY LETTERS, 21(1–4), 137–139.https://doi.org/10.1109/LPT.2008.2009228 
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