@article{1183526404, author = {Sakai, Sh\^oichir\^o}, title = {A Radon-Nikodym theorem in $W^*$-algebras}, journal = {Bull. Amer. Math. Soc.}, volume = {71}, number = {6}, year = {1965}, pages = { 149-151}, language = {en}, url = {http://dml.mathdoc.fr/item/1183526404} }
Sakai, Shôichirô. A Radon-Nikodym theorem in $W^*$-algebras. Bull. Amer. Math. Soc., Tome 71 (1965) no. 6, pp. 149-151. http://gdmltest.u-ga.fr/item/1183526404/