@article{SF_1983__26_134592,
     author = {G. Cupona},
     title = {Vector valued semigroups.},
     journal = {Semigroup forum},
     pages = {65--74},
     publisher = {mathdoc},
     volume = {26},
     year = {1983},
     zbl = {0504.20045},
     url = {http://geodesic.mathdoc.fr/item/SF_1983__26_134592/}
}