@article{IM_1980__61_142751,
     author = {Ian Hambleton and R. James Milgram},
     title = {The {Surgery} {Obstruction} {Groups} for {Finite} {2-Groups.}},
     journal = {Inventiones mathematicae},
     pages = {33--52},
     publisher = {mathdoc},
     volume = {61},
     year = {1980},
     zbl = {0455.57016},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__61_142751/}
}