@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},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {13},
     year = {1994-1995},
     mrnumber = {1715965},
     zbl = {0901.57001},
     language = {en},
     url = {http://archive.numdam.org/item/TSG_1994-1995__13__167_0/}
}