@article{CMH_1977__52_139703,
     author = {John Smillie},
     title = {Flat manifolds with non-zero {Euler} characteristics.},
     journal = {Commentarii mathematici Helvetici},
     pages = {453--456},
     publisher = {mathdoc},
     volume = {52},
     year = {1977},
     zbl = {0357.53021},
     url = {http://geodesic.mathdoc.fr/item/CMH_1977__52_139703/}
}