@article{1093890994,
author = {Harris, James F.},
title = {Secondary extensions, meanings and non-null terms.},
journal = {Notre Dame J. Formal Logic},
volume = {14},
number = {1},
year = {1973},
pages = { 316-322},
language = {en},
url = {http://dml.mathdoc.fr/item/1093890994}
}
Harris, James F. Secondary extensions, meanings and non-null terms.. Notre Dame J. Formal Logic, Tome 14 (1973) no. 1, pp. 316-322. http://gdmltest.u-ga.fr/item/1093890994/