@article{PORMA_2003__60_1_50443,
     author = {Klaus, Stephan},
     title = {Cochain operations and subspace arrangements.},
     journal = {Portugaliae mathematica},
     pages = {71--98},
     publisher = {mathdoc},
     volume = {60},
     number = {1},
     year = {2003},
     zbl = {1027.18008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2003__60_1_50443/}
}