@article{10_4064_sm_40_3_199_223,
     author = {Gregers Krabbe},
     title = {Linear operators and operational calculus. {Part} {I}},
     journal = {Studia Mathematica},
     pages = {199--223},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {1971},
     doi = {10.4064/sm-40-3-199-223},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-40-3-199-223/}
}