@article{MS2_1972__30_166221,
     author = {Erling Stormer},
     title = {On {Projection} {Maps} of von {Neumann} {Algebras.}},
     journal = {Mathematica Scandinavica},
     pages = {46--50},
     publisher = {mathdoc},
     volume = {30},
     year = {1972},
     zbl = {0239.46071},
     url = {http://geodesic.mathdoc.fr/item/MS2_1972__30_166221/}
}