@article{SF_1993__47_2_135286,
     author = {C.R. Day},
     title = {Spectral mapping theorem for integrated semigroups.},
     journal = {Semigroup forum},
     pages = {359--372},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1993},
     zbl = {0812.47036},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135286/}
}