@article{1183737951,
author = {McKenzie, Ralph},
title = {Negative Solution of the Decision Problem for Sentences True in Every Subalgebra of $<N, +>$},
journal = {J. Symbolic Logic},
volume = {36},
number = {1},
year = {1971},
pages = { 607-609},
language = {en},
url = {http://dml.mathdoc.fr/item/1183737951}
}
McKenzie, Ralph. Negative Solution of the Decision Problem for Sentences True in Every Subalgebra of $$. J. Symbolic Logic, Tome 36 (1971) no. 1, pp. 607-609. http://gdmltest.u-ga.fr/item/1183737951/