@article{JRAM_1969__235_150919,
     author = {H. Kober},
     title = {Operators involving entire functions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {115--132},
     publisher = {mathdoc},
     volume = {235},
     year = {1969},
     zbl = {0174.19601},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1969__235_150919/}
}