@article{MM2_1974__14_154278,
     author = {Ernst Albrecht},
     title = {Funktionalkalk\"ule in mehreren {Ver\"anderlichen} f\"ur stetige lineare {Operatoren} auf {Banachr\"aumen.}},
     journal = {Manuscripta mathematica},
     pages = {1--40},
     publisher = {mathdoc},
     volume = {14},
     year = {1974},
     zbl = {0294.47013},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__14_154278/}
}