Geodesic
Two unsolvable classes of formulas of classical predicate calculus
Zapiski Nauchnykh Seminarov POMI, Studies in constructive mathematics and mathematical logic. Part II, Tome 8 (1968), pp. 202-210

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     author = {V. P. Orevkov},
     title = {Two unsolvable classes of formulas of classical predicate calculus},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {202--210},
     publisher = {mathdoc},
     volume = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1968_8_a22/}
}
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V. P. Orevkov. Two unsolvable classes of formulas of classical predicate calculus. Zapiski Nauchnykh Seminarov POMI, Studies in constructive mathematics and mathematical logic. Part II, Tome 8 (1968), pp. 202-210. http://geodesic.mathdoc.fr/item/ZNSL_1968_8_a22/