Seems like I found something useful by myself:
In case someone else is interested, here a short article of Peter Michor on that topic
[Michor][1] https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0CE4QFjAC&url=http%3A%2F%2Fwww.mat.univie.ac.at%2F~michor%2Fci-alg.pdf&ei=JN_LUJDVFcfvswaKsID4DA&usg=AFQjCNGkK_4pUfWD3YInz3vu9QUqGgmoGA&sig2=fx2eSO_GZhT-oyR7_QYrGw&bvm=bv.1355325884,d.Yms
[1]:Michor