SL(2) has no C1-extension to a half-space.
Horne, J.G.
Semigroup forum, Tome 7 (1974), p. 286-291 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1974-01-01
EUDML-ID : urn:eudml:doc:134011 
@article{GDZPPN001249568,
     title = {SL(2) has no C1-extension to a half-space.},
     journal = {Semigroup forum},
     volume = {7},
     year = {1974},
     pages = {286-291},
     zbl = {0276.22013},
     url = {http://dml.mathdoc.fr/item/GDZPPN001249568}
}

Horne, J.G. SL(2) has no C1-extension to a half-space.. Semigroup forum, Tome 7 (1974) pp. 286-291. http://gdmltest.u-ga.fr/item/GDZPPN001249568/