Fundaments of Quaternionic Clifford Analysis I
  Introducing a quaternionic structure on Euclidean space, the fundaments for quaternionic and symplectic Clifford analysis are studied in detail from the viewpoint of invariance for the symplectic group action. 
Fred Brackx, Hennie De Schepper, David Eelbode, Roman Lavicka,   Vladimir Soucek
math.AP math.CA math.RT