@article{JRAM_1993__443_153560,
     author = {Ian Hambleton and Matthias Kreck},
     title = {Cancellation of hyperbolic forms and topological four-manifolds.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {21--48},
     publisher = {mathdoc},
     volume = {443},
     year = {1993},
     zbl = {0779.57014},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1993__443_153560/}
}