Proper homotopies in l 2 -manifolds
Compositio Mathematica, Volume 23 (1971) no. 2, p. 155-157 
@article{CM_1971__23_2_155_0,
     author = {Anderson, R. D.},
     title = {Proper homotopies in $l\_2$-manifolds},
     journal = {Compositio Mathematica},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {23},
     number = {2},
     year = {1971},
     pages = {155-157},
     zbl = {0218.57007},
     mrnumber = {290411},
     language = {en},
     url = {http://www.numdam.org/item/CM_1971__23_2_155_0}
}

Anderson, R. D. Proper homotopies in $l_2$-manifolds. Compositio Mathematica, Volume 23 (1971) no. 2, pp. 155-157. http://www.numdam.org/item/CM_1971__23_2_155_0/

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