Geodesic
Harmonic functions connected with finite von Neumann algebras
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 5 
V. P. Yashnikov. Harmonic functions connected with finite von Neumann algebras. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 5. http://geodesic.mathdoc.fr/item/RM_1971_26_5_a16/
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     author = {V. P. Yashnikov},
     title = {Harmonic functions connected with finite von {Neumann} algebras},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1971},
     volume = {26},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_5_a16/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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[4] A. E. Taylor, “Biharmonic functions in abstract spaces”, Amer. J. Math., 60 (1938), 416–422 | DOI | MR