@article{JOLT_2005_15_2_a5,
     author = {M. Kankaanrinta},
     title = {Lifting {Smooth} {Homotopies} of {Orbit} {Spaces} of {Proper} {Lie} {Group} {Actions}},
     journal = {Journal of Lie Theory},
     pages = {447--456},
     year = {2005},
     volume = {15},
     number = {2},
     doi = {10.5802/jolt.385},
     zbl = {1079.57025},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.385/}
}