@article{JRAM_1984__347_152596,
     author = {Schoichi Ota},
     title = {Commutants of unbounded derivations in {C*-algebras.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {21--32},
     publisher = {mathdoc},
     volume = {347},
     year = {1984},
     zbl = {0516.46042},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1984__347_152596/}
}