@article{STUMA_1996__119_3_216298,
     author = {Celso Martinez and Miguel Sanz},
     title = {A note on a formula for the fractional powers of infinitesimal generators of semigroups},
     journal = {Studia Mathematica},
     pages = {247},
     publisher = {mathdoc},
     volume = {119},
     number = {3},
     year = {1996},
     zbl = {0857.47009},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/STUMA_1996__119_3_216298/}
}