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@article{MAN_1979__239_163207, author = {Peter Volkmann and Ray Redheffer}, title = {Differential {Equations} in {Operator} {Algebras.} {I.} {Invariance} of the {Siegel} {Disk.}}, journal = {Mathematische Annalen}, pages = {97--110}, publisher = {mathdoc}, volume = {239}, year = {1979}, zbl = {0417.34097}, url = {http://geodesic.mathdoc.fr/item/MAN_1979__239_163207/} }
Peter Volkmann; Ray Redheffer. Differential Equations in Operator Algebras. I. Invariance of the Siegel Disk.. Mathematische Annalen, Tome 239 (1979), pp. 97-110. http://geodesic.mathdoc.fr/item/MAN_1979__239_163207/