@article{MZ_1973__133_171944,
     author = {Richard Duncan},
     title = {On a {Class} of {Markov} {Processes} in {Hilbert} {Space.}},
     journal = {Mathematische Zeitschrift},
     pages = {93--108},
     publisher = {mathdoc},
     volume = {133},
     year = {1973},
     zbl = {0253.60069},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__133_171944/}
}