@article{IM_1976__31_142364,
     author = {D. McDuff and G. Segal},
     title = {Homology {Fibrations} and the },
     journal = {Inventiones mathematicae},
     pages = {279--284},
     publisher = {mathdoc},
     volume = {31},
     year = {1976},
     zbl = {0306.55020},
     url = {http://geodesic.mathdoc.fr/item/IM_1976__31_142364/}
}