@article{MAN_1966__163_161365,
     author = {P.L. Butzer and H. BERENS},
     title = {\"Uber die {Stetigkeit} von {Halbgruppen} von {Operatoren} in intermedi\"aren {R\"aumen.}},
     journal = {Mathematische Annalen},
     pages = {204--211},
     publisher = {mathdoc},
     volume = {163},
     year = {1966},
     zbl = {0134.11902},
     url = {http://geodesic.mathdoc.fr/item/MAN_1966__163_161365/}
}