@article{TMF_2009_160_1_a14,
     author = {F. Masillo and G. Scolarici and S. Sozzo},
     title = {Proper versus improper mixtures: {Toward} a~quaternionic quantum mechanics},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {157--167},
     publisher = {mathdoc},
     volume = {160},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2009_160_1_a14/}
}