@article{AIHPA_1976__25_2_139_0,
     author = {Bratteli, Ola and Robinson, Derek W.},
     title = {Unbounded derivations of von {Neumann} algebras},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {139--164},
     publisher = {Gauthier-Villars},
     volume = {25},
     number = {2},
     year = {1976},
     mrnumber = {425632},
     zbl = {0332.46043},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1976__25_2_139_0/}
}