1. Adler, S.L.: Quaternionic Quantum Mechanics and Quantum Fields, International Series of Monographs on Physics, vol. 88. Oxford University Press, Oxford (1995)
2. Alpay, D., Luna-Elizarraras, M.E., Shapiro, M., Struppa, D.C.: Basics of Functional Analysis with Bicomplex Scalars, and Bicomplex Schur Analysis, Springer-Briefs in Mathematics. Springer, Berlin (2014)
3. Bisi, C., Winkelmann, J.: On a quaternionic Picard theorem. Proc. Am. Math. Soc. Ser. B 7, 106–117 (2020)
4. Bisi, C., Winkelmann, J.: The harmonicity of slice regular functions. J. Geom. Anal. 31, 7773–7811 (2021)
5. Brackx, F., Delanghe, R., Sommen, F.: Clifford Analysis, Research Notes in Mathematics, vol. 76. Pitman (Advanced Publishing Program), Boston (1982)