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@article{CM_1987__61_1_61_0, author = {Ryan, John}, title = {Hypercomplex algebras, hypercomplex analysis and conformal invariance}, journal = {Compositio Mathematica}, pages = {61--80}, publisher = {Martinus Nijhoff Publishers}, volume = {61}, number = {1}, year = {1987}, mrnumber = {879189}, zbl = {0609.32005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1987__61_1_61_0/} }
Ryan, John. Hypercomplex algebras, hypercomplex analysis and conformal invariance. Compositio Mathematica, Tome 61 (1987) no. 1, pp. 61-80. http://geodesic.mathdoc.fr/item/CM_1987__61_1_61_0/