@article{1102985564,
author = {Geiger, David},
title = {Closed systems of functions and predicates.},
journal = {Pacific J. Math.},
volume = {27},
number = {3},
year = {1968},
pages = { 95-100},
language = {en},
url = {http://dml.mathdoc.fr/item/1102985564}
}
Geiger, David. Closed systems of functions and predicates.. Pacific J. Math., Tome 27 (1968) no. 3, pp. 95-100. http://gdmltest.u-ga.fr/item/1102985564/