@article{IM2_1990_34_2_a0,
     author = {Sh. A. Ayupov and Sh. M. Usmanov},
     title = {Diameters of state spaces of {Jordan} {Banach} algebras},
     journal = {Izvestiya. Mathematics},
     pages = {229--244},
     year = {1990},
     volume = {34},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_34_2_a0/}
}