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@article{MASLO_1984__34_3_a11, author = {Navara, Mirko}, title = {Two-valued states on a concrete logic and the additivity problem}, journal = {Mathematica slovaca}, pages = {329--336}, publisher = {mathdoc}, volume = {34}, number = {3}, year = {1984}, mrnumber = {756991}, zbl = {0597.28004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1984__34_3_a11/} }
Navara, Mirko. Two-valued states on a concrete logic and the additivity problem. Mathematica slovaca, Tome 34 (1984) no. 3, pp. 329-336. http://geodesic.mathdoc.fr/item/MASLO_1984__34_3_a11/