@article{MASLO_1981_31_2_a4,
     author = {Dvure\v{c}enskij, Anatolij},
     title = {On extension properties for observables},
     journal = {Mathematica slovaca},
     pages = {149--153},
     year = {1981},
     volume = {31},
     number = {2},
     mrnumber = {611626},
     zbl = {0474.03032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1981_31_2_a4/}
}