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Published online by Cambridge University Press: 20 November 2018
If $X$ is a connected complex manifold with
${{d}_{X}}\,=\,2$ that admits a (connected) Lie group
$G$ acting transitively as a group of holomorphic transformations, then the action extends to an action of the complexification
$\widehat{G}$ of
$G$ on
$X$ except when either the unit disk in the complex plane or a strictly pseudoconcave homogeneous complex manifold is the base or fiber of some homogeneous fibration of
$X$.