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@article{MASLO_1980__30_2_a11, author = {Dvure\v{c}enskij, Anatolij}, title = {On a sum of observables in a logic}, journal = {Mathematica slovaca}, pages = {187--196}, publisher = {mathdoc}, volume = {30}, number = {2}, year = {1980}, mrnumber = {587245}, zbl = {0435.03040}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1980__30_2_a11/} }
Dvurečenskij, Anatolij. On a sum of observables in a logic. Mathematica slovaca, Tome 30 (1980) no. 2, pp. 187-196. http://geodesic.mathdoc.fr/item/MASLO_1980__30_2_a11/