@article{IM2_2010_74_4_a9,
     author = {M. E. Shirokov},
     title = {On properties of the space of quantum states and their 
},
     journal = {Izvestiya. Mathematics },
     pages = {849--882},
     publisher = {mathdoc},
     volume = {74},
     number = {4},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2010_74_4_a9/}
}