1. Bülow, T.: Hypercomplex spectral signal representations for the processing and analysis of images. Ph.D. Thesis, Institut für Informatik und Praktische Mathematik, University of Kiel, Germany (1999)
2. Chen, L.P., Kou, K.I., Liu, M.S.: Pitt’s inequality and the uncertainty principle associated with thequaternion Fourier transform. J. Math. Anal. Appl. 423, 681–700 (2015)
3. Christensen, J.G.: Uncertainty Principles. Master’s Thesis, Institute for Mathematical Sciences, University of Copenhagen (2003)
4. De Bie, H.: New techniques for two-sided quaternion Fourier transform, In: Procedings of AGACSE (2012)
5. Eckhard, M., Hitzer, S.: Quaternion Fourier transform on quaternion fields and generalizations (2013).
arXiv:1306.1023v1
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