@article{1093635155,
author = {Englebretsen, George},
title = {Formatives.},
journal = {Notre Dame J. Formal Logic},
volume = {30},
number = {2},
year = {1989},
pages = { 382-389},
language = {en},
url = {http://dml.mathdoc.fr/item/1093635155}
}
Englebretsen, George. Formatives.. Notre Dame J. Formal Logic, Tome 30 (1989) no. 2, pp. 382-389. http://gdmltest.u-ga.fr/item/1093635155/