@article{700680,
     title = {Derivations of quotients of von Neumann algebras},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicist},
     address = {Praha},
     year = {1977},
     pages = {[393]-[393]},
     zbl = {0368.46055},
     url = {http://dml.mathdoc.fr/item/700680}
}

Ringrose, J. R. Derivations of quotients of von Neumann algebras, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), p. [393]. http://gdmltest.u-ga.fr/item/700680/