@article{MZ_1968__103_170902,
     author = {Bernhard Gramsch},
     title = {Zur {Fotsetzung} der {Integrationshalbgruppe.}},
     journal = {Mathematische Zeitschrift},
     pages = {117--121},
     publisher = {mathdoc},
     volume = {103},
     year = {1968},
     zbl = {0152.32803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170902/}
}