1. Andersson, L., Jawerth, B., Mitrea, M.: The Cauchy singular integral operator and clifford wavelets. In: Wavelets: Mathematics and Applications, pp. 525–546. CRC Press (1994)
2. Bas, P., Bihan, N. L., Chassery, J. M.: Color image watermarking using quaternion Fourier transform. In: IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 3, pp. 521–524, Hong-Kong (2003)
3. Bracewell, R.N.: The Fourier Transform and its Applications, 2nd edn. McGraw-Hill, New York (1978)
4. Brackx, F., Delanghe, R., Sommen, F.: Clifford analysis. In: Research Notes in Mathematics, vol. 76, Pitman Advanced Publishing Company, Boston, London, Melbourne (1982)
5. Brackx, F., Schepper, N.D., Sommen, F.: The Clifford–Fourier transform. J. Fourier Anal. Appl. 11(6), 669–681 (2005)