@article{CMH_1995__70_3_140377,
     author = {M. Kreck and W. L\"uck and P. Teichner},
     title = {Counterexamples to the {Kneser} conjecture in dimension four.},
     journal = {Commentarii mathematici Helvetici},
     pages = {423--433},
     publisher = {mathdoc},
     volume = {70},
     number = {3},
     year = {1995},
     zbl = {0837.57016},
     url = {http://geodesic.mathdoc.fr/item/CMH_1995__70_3_140377/}
}