@article{GDZPPN00231679X,
title = {Differential Equations in Operator Algebras. I. Invariance of the Siegel Disk.},
journal = {Mathematische Annalen},
volume = {243},
year = {1979},
pages = {97-110},
zbl = {0417.34097},
url = {http://dml.mathdoc.fr/item/GDZPPN00231679X}
}
Volkmann, Peter; Redheffer, Ray. Differential Equations in Operator Algebras. I. Invariance of the Siegel Disk.. Mathematische Annalen, Tome 243 (1979) pp. 97-110. http://gdmltest.u-ga.fr/item/GDZPPN00231679X/