no. 3
The diffeomorphic excision of closed local compacta from infinite-dimensional Hilbert manifolds
Compositio Mathematica, Tome 21 (1969) no. 3, pp. 271-291. 
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     author = {West, James E.},
     title = {The diffeomorphic excision of closed local compacta from infinite-dimensional {Hilbert} manifolds},
     journal = {Compositio Mathematica},
     pages = {271--291},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
     number = {3},
     year = {1969},
     mrnumber = {256420},
     zbl = {0181.51303},
     language = {en},
     url = {http://www.numdam.org/item/CM_1969__21_3_271_0/}
}
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West, James E. The diffeomorphic excision of closed local compacta from infinite-dimensional Hilbert manifolds. Compositio Mathematica, Tome 21 (1969) no. 3, pp. 271-291. http://www.numdam.org/item/CM_1969__21_3_271_0/

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