Geodesic
Unsolvability in constructive predicate calculus of a class of formulas of type $\daleth\daleth\forall\exists$
Doklady Akademii Nauk, Tome 163 (1965) no. 3, pp. 581-583.

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@article{DAN_1965_163_3_a10,
     author = {V. P. Orevkov},
     title = {Unsolvability in constructive predicate calculus of a class of formulas of type $\daleth\daleth\forall\exists$},
     journal = {Doklady Akademii Nauk},
     pages = {581--583},
     publisher = {mathdoc},
     volume = {163},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_163_3_a10/}
}
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V. P. Orevkov. Unsolvability in constructive predicate calculus of a class of formulas of type $\daleth\daleth\forall\exists$. Doklady Akademii Nauk, Tome 163 (1965) no. 3, pp. 581-583. http://geodesic.mathdoc.fr/item/DAN_1965_163_3_a10/