@article{bwmeta1.element.bwnjournal-article-fmv115i1p16bwm,
author = {Alexander H\"aussler},
title = {Defining cardinal addition by $\leq$-formulas},
journal = {Fundamenta Mathematicae},
volume = {115},
year = {1983},
pages = {195-205},
zbl = {0517.03017},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv115i1p16bwm}
}
Häussler, Alexander. Defining cardinal addition by ≤-formulas. Fundamenta Mathematicae, Tome 115 (1983) pp. 195-205. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv115i1p16bwm/