@article{1093883516,
author = {Jennings, R. E. and Schotch, P. K. and Johnston, D. K.},
title = {The $n$-adic first-order undefinability of the Geach formula.},
journal = {Notre Dame J. Formal Logic},
volume = {22},
number = {1},
year = {1981},
pages = { 375-378},
language = {en},
url = {http://dml.mathdoc.fr/item/1093883516}
}
Jennings, R. E.; Schotch, P. K.; Johnston, D. K. The $n$-adic first-order undefinability of the Geach formula.. Notre Dame J. Formal Logic, Tome 22 (1981) no. 1, pp. 375-378. http://gdmltest.u-ga.fr/item/1093883516/