1. London Mathematical Society Lecture Note Series;P. Lounesto,1997
2. Porteous I R. Clifford algebras and the classical groups. Cambridge Studies in Advanced Mathematics, 50. Cambridge: Cambridge University Press, 1995, 295
3. Gürlebeck K, Sprössig W. Quaternionic and Clifford Calculus for Physicists and Engineers. Chichester: John Wiley and Sons, 1997, 371
4. Cowling M, Dooley A H, Korányi A, et al. H-type groups and Iwasawa decompositions. Adv Math, 87(1): 1–41 (1991)
5. Calin O, Chang D C, Greiner P C. Geometric Analysis on the Heisenberg Group and Its Generalizations, to be published in AMS/IP series in advanced mathematics. Cambridge-Massachusetts: International Press, 2005