@article{EXMA_2004__13_3_231233,
     author = {Ash, Avner and Pollack, David and Soares, Dayna},
     title = {-extensions of  and arithmetic cohomology modulo 2.},
     journal = {Experimental mathematics},
     pages = {297--307},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {2004},
     zbl = {1094.11019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_2004__13_3_231233/}
}