@article{CMH_1980__55_139838,
     author = {I. Madsen and L.R. Taylor and B. Williams},
     title = {Tangential homotopy equivalences.},
     journal = {Commentarii mathematici Helvetici},
     pages = {445--484},
     publisher = {mathdoc},
     volume = {55},
     year = {1980},
     zbl = {0451.57018},
     url = {http://geodesic.mathdoc.fr/item/CMH_1980__55_139838/}
}