@article{SF_1993__47_2_135251,
     author = {S.Y. Shaw and Y.C. Li},
     title = {On generators of integrated {C-semigroups} and {C} -cosine functions.},
     journal = {Semigroup forum},
     pages = {29--35},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1993},
     zbl = {0804.47044},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135251/}
}