@article{MAN_1990__287_1_164670,
     author = {J.M.A.M. van Neerven},
     title = {Hahn-Banach type theorems for adjoint semigroups.},
     journal = {Mathematische Annalen},
     pages = {63--72},
     year = {1990},
     volume = {287},
     number = {1},
     zbl = {0671.47035},
     url = {http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164670/}
}