@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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