@article{MZ_1967__97_170710,
     author = {Wolfgang Beekmann},
     title = {Mercer-S\"atze f\"ur abschnittsbeschr\"ankte {Matrixtransformationen.}},
     journal = {Mathematische Zeitschrift},
     pages = {154--157},
     publisher = {mathdoc},
     volume = {97},
     year = {1967},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__97_170710/}
}