Milnor-Wood inequality for crystallographic groups
Séminaire de théorie spectrale et géométrie, Tome 13 (1994-1995), pp. 167-170 
@article{TSG_1994-1995__13__167_0,
     author = {Minakawa, Hiroyuki},
     title = {Milnor-Wood inequality for crystallographic groups},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {167--170},
     year = {1994-1995},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {13},
     mrnumber = {1715965},
     zbl = {0901.57001},
     language = {en},
     url = {https://www.numdam.org/item/TSG_1994-1995__13__167_0/}
}
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Minakawa, Hiroyuki. Milnor-Wood inequality for crystallographic groups. Séminaire de théorie spectrale et géométrie, Tome 13 (1994-1995), pp. 167-170. https://www.numdam.org/item/TSG_1994-1995__13__167_0/

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