@article{10_4064_sm191_1_2,
     author = {Ralph deLaubenfels},
     title = {Inverses of generators of nonanalytic semigroups},
     journal = {Studia Mathematica},
     pages = {11--38},
     year = {2009},
     volume = {191},
     number = {1},
     doi = {10.4064/sm191-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm191-1-2/}
}