@article{GeoVra:71b,
  journal = {Rev. Roumaine Math. Pures Appl.},
  volume = {16},
  title = {On a {G}leason's theorem},
  author = {Georgescu, George and Vraciu, Constantin},
  year = {1971},
  fjournal = {Acad\'emie de la R\'epublique Populaire Roumaine. Revue Roumaine
              de Math\'ematiques Pures et Appliqu\'ees},
  pages = {371--374},
}