Assertions depending on time and corresponding logical calculi
Compositio Mathematica, Tome 20 (1968), pp. 83-87 
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     year = {1968},
     publisher = {Wolters-Noordhoff Publishing},
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     mrnumber = {230599},
     zbl = {0175.26302},
     language = {en},
     url = {https://www.numdam.org/item/CM_1968__20__83_0/}
}
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Grzegorczyk, Andrzej. Assertions depending on time and corresponding logical calculi. Compositio Mathematica, Tome 20 (1968), pp. 83-87. https://www.numdam.org/item/CM_1968__20__83_0/

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