@article{SM_1970_10_2_a3,
     author = {I. Ya. Dorfman},
     title = {On~means and the {Laplacian} of functions on {Hilbert} space},
     journal = {Sbornik. Mathematics},
     pages = {181--196},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_10_2_a3/}
}