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On the differentialbility of maps into lie transformation groups. Helmut Reckziegel, Martin Linden (1989) Manuscripta mathematica
On the G-spaces having an 𝒮 -G-CW-approximation by a G-CW-complex of finite G-type Martin Markl (1983) Commentationes Mathematicae Universitatis Carolinae
On the stratification of the orbit space for the action of automorphisms on connections [Book] Witold Kondracki, Jan Rogulski (1986)