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@article{CM_1968__20__83_0, author = {Grzegorczyk, Andrzej}, title = {Assertions depending on time and corresponding logical calculi}, journal = {Compositio Mathematica}, pages = {83--87}, publisher = {Wolters-Noordhoff Publishing}, volume = {20}, year = {1968}, mrnumber = {230599}, zbl = {0175.26302}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1968__20__83_0/} }
Grzegorczyk, Andrzej. Assertions depending on time and corresponding logical calculi. Compositio Mathematica, Tome 20 (1968), pp. 83-87. http://geodesic.mathdoc.fr/item/CM_1968__20__83_0/