@Article{ 
  GhiRec16,
  author = { Ghiloni, Riccardo and Recupero, Vincenzo },
  title = { Semigroups over real alternative *-algebras: generation theorems and spherical sectorial operators },
  journal = { Trans. Amer. Math. Soc. },
  year = { 2016 },
  doi = { 10.1090/tran/6399 },
  volume = { 368 },
  number = { 4 },
  pages = { 2645-2678 },
  URL = { https://gecogedi.dimai.unifi.it/paper/110/ },
  note = { cvgmt preprint}
}