@article{CM_1968__20__88_0,
author = {Henkin, Leon},
title = {Relativization with respect to formulas and its use in proofs of independence},
journal = {Compositio Mathematica},
volume = {20},
year = {1968},
pages = {88-106},
mrnumber = {234812},
zbl = {0155.02301},
language = {en},
url = {http://dml.mathdoc.fr/item/CM_1968__20__88_0}
}
Henkin, Leon. Relativization with respect to formulas and its use in proofs of independence. Compositio Mathematica, Tome 20 (1968) pp. 88-106. http://gdmltest.u-ga.fr/item/CM_1968__20__88_0/
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