no. 3
The Hauptvermutung for C ∞ homeomorphisms II. A proof valid for open 4-manifolds
Compositio Mathematica, Tome 29 (1974) no. 3, pp. 253-264 
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     author = {Scharlemann, M. G. and Siebenmann, L. C.},
     title = {The {Hauptvermutung} for $C^\infty $ homeomorphisms {II.} {A} proof valid for open 4-manifolds},
     journal = {Compositio Mathematica},
     pages = {253--264},
     year = {1974},
     publisher = {Noordhoff International Publishing},
     volume = {29},
     number = {3},
     zbl = {0315.57010},
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     url = {https://www.numdam.org/item/CM_1974__29_3_253_0/}
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Scharlemann, M. G.; Siebenmann, L. C. The Hauptvermutung for $C^\infty $ homeomorphisms II. A proof valid for open 4-manifolds. Compositio Mathematica, Tome 29 (1974) no. 3, pp. 253-264. https://www.numdam.org/item/CM_1974__29_3_253_0/

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