@article{ZNSL_1972_29_a16,
     author = {A. M. Vershik},
     title = {A~geometric theory of states, von {Neumann} boundary, duality of $C^*$-algebras},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {147--154},
     publisher = {mathdoc},
     volume = {29},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_29_a16/}
}