@article{1183734709,
author = {Krom, M. R.},
title = {Separation Principles in the Hierarchy Theory of Pure First-Order Logic},
journal = {J. Symbolic Logic},
volume = {28},
number = {1},
year = {1963},
pages = { 222-236},
language = {en},
url = {http://dml.mathdoc.fr/item/1183734709}
}
Krom, M. R. Separation Principles in the Hierarchy Theory of Pure First-Order Logic. J. Symbolic Logic, Tome 28 (1963) no. 1, pp. 222-236. http://gdmltest.u-ga.fr/item/1183734709/