%0 Journal Article %A Ryan, John %T Hypercomplex algebras, hypercomplex analysis and conformal invariance %J Compositio Mathematica %D 1987 %P 61-80 %V 61 %N 1 %I Martinus Nijhoff Publishers %U http://www.numdam.org/item/CM_1987__61_1_61_0/ %G en %F CM_1987__61_1_61_0