@article{PMIHES_2001__94__5_0,
     author = {Brylinski, Jean-Luc and Deligne, Pierre},
     title = {Central extensions of reductive groups by $K_2$},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--85},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {94},
     year = {2001},
     mrnumber = {1896177},
     zbl = {1093.20027},
     language = {en},
     url = {http://archive.numdam.org/item/PMIHES_2001__94__5_0/}
}