@article{SF_1984__28_134656,
     author = {A. Nagy},
     title = {Weakly exponential semigroups.},
     journal = {Semigroup forum},
     pages = {291--302},
     publisher = {mathdoc},
     volume = {28},
     year = {1984},
     zbl = {0524.20037},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__28_134656/}
}