Geodesic
Undecidable properties of extensions of provability logic
Algebra i logika, Tome 29 (1990) no. 3, pp. 350-367.

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@article{AL_1990_29_3_a6,
     author = {A. V. Chagrov},
     title = {Undecidable properties of extensions of provability logic},
     journal = {Algebra i logika},
     pages = {350--367},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1990_29_3_a6/}
}
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A. V. Chagrov. Undecidable properties of extensions of provability logic. Algebra i logika, Tome 29 (1990) no. 3, pp. 350-367. http://geodesic.mathdoc.fr/item/AL_1990_29_3_a6/