@article{CMH_1969__44_139393,
     author = {Joel M. Cohen},
     title = {Coherent {Graded} {Rings} and the {Non-Existence} of {Spaces} of {Finite} {Stable} {Homotopy} {Type.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {217--228},
     publisher = {mathdoc},
     volume = {44},
     year = {1969},
     zbl = {0176.20903},
     url = {http://geodesic.mathdoc.fr/item/CMH_1969__44_139393/}
}