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@article{MM2_1986__54_155101, author = {Karl H. Hofmann and Joachim Hilgert}, title = {Old and {New} on {S1(2).}}, journal = {Manuscripta mathematica}, pages = {17--52}, publisher = {mathdoc}, volume = {54}, year = {1986}, zbl = {0605.22004}, url = {http://geodesic.mathdoc.fr/item/MM2_1986__54_155101/} }
Karl H. Hofmann; Joachim Hilgert. Old and New on S1(2).. Manuscripta mathematica, Tome 54 (1986), pp. 17-52. http://geodesic.mathdoc.fr/item/MM2_1986__54_155101/