@article{05663791, title = {On proper R-actions on hyperbolic Stein surfaces.}, journal = {Documenta Mathematica}, volume = {14}, year = {2009}, pages = {673-689}, zbl = {1185.32007}, language = {en}, url = {http://dml.mathdoc.fr/item/05663791} }
Miebach, Christian; Oeljeklaus, Karl. On proper R-actions on hyperbolic Stein surfaces.. Documenta Mathematica, Tome 14 (2009) pp. 673-689. http://gdmltest.u-ga.fr/item/05663791/