@article{10_2140_agt_2007_7_1,
     author = {Kankaanrinta, Marja},
     title = {Equivariant collaring, tubular neighbourhood and gluing theorems for proper {Lie} group actions},
     journal = {Algebraic and Geometric Topology},
     pages = {1--27},
     year = {2007},
     volume = {7},
     number = {1},
     doi = {10.2140/agt.2007.7.1},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2007.7.1/}
}