no. 1
The density problem for infinite dimensional group actions
Compositio Mathematica, Tome 68 (1988) no. 1, pp. 3-10. 
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Klimek, S.; Kondracki, W.; Oledzki, W.; Sadowski, P. The density problem for infinite dimensional group actions. Compositio Mathematica, Tome 68 (1988) no. 1, pp. 3-10. http://www.numdam.org/item/CM_1988__68_1_3_0/

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