@article{10_4064_sm170_3_1,
     author = {Thomas Ransford and Michel Valley},
     title = {Subharmonicity in von {Neumann} algebras},
     journal = {Studia Mathematica},
     pages = {219--226},
     year = {2005},
     volume = {170},
     number = {3},
     doi = {10.4064/sm170-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm170-3-1/}
}