Geodesic
Unsolvability of the problem of functional expressibility in the modal logic $\mathrm{S}4$
Doklady Akademii Nauk, Tome 268 (1983) no. 4, pp. 814-817.

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     author = {M. F. Ra\c{t}\u{a}},
     title = {Unsolvability of the problem of functional expressibility in the modal logic $\mathrm{S}4$},
     journal = {Doklady Akademii Nauk},
     pages = {814--817},
     publisher = {mathdoc},
     volume = {268},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a9/}
}
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M. F. Raţă. Unsolvability of the problem of functional expressibility in the modal logic $\mathrm{S}4$. Doklady Akademii Nauk, Tome 268 (1983) no. 4, pp. 814-817. http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a9/