Two theorems on de Rham cohomology
Compositio Mathematica, Tome 40 (1980) no. 3, pp. 417-423. 
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     author = {Lang, William E.},
     title = {Two theorems on de {Rham} cohomology},
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     pages = {417--423},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {40},
     number = {3},
     year = {1980},
     mrnumber = {571059},
     zbl = {0508.14011},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1980__40_3_417_0/}
}
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Lang, William E. Two theorems on de Rham cohomology. Compositio Mathematica, Tome 40 (1980) no. 3, pp. 417-423. http://archive.numdam.org/item/CM_1980__40_3_417_0/

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