@article{IM_1971__12_142076,
     author = {N. Ray},
     title = {The {Symplectic} {J-Homomorphism.}},
     journal = {Inventiones mathematicae},
     pages = {237--248},
     publisher = {mathdoc},
     volume = {12},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/IM_1971__12_142076/}
}