no. 3
A metric characterization of manifolds with boundary
Compositio Mathematica, Tome 81 (1992) no. 3, pp. 337-354. 
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     author = {Plaut, Conrad},
     title = {A metric characterization of manifolds with boundary},
     journal = {Compositio Mathematica},
     pages = {337--354},
     publisher = {Kluwer Academic Publishers},
     volume = {81},
     number = {3},
     year = {1992},
     mrnumber = {1149173},
     zbl = {0748.53046},
     language = {en},
     url = {http://www.numdam.org/item/CM_1992__81_3_337_0/}
}
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Plaut, Conrad. A metric characterization of manifolds with boundary. Compositio Mathematica, Tome 81 (1992) no. 3, pp. 337-354. http://www.numdam.org/item/CM_1992__81_3_337_0/

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