@article{1093887832,
author = {Harper, Judith M. and Rubin, Jean E.},
title = {Variations of Zorn's lemma, principles of cofinality, and Hausdorff's maximal principle. II. Class forms.},
journal = {Notre Dame J. Formal Logic},
volume = {18},
number = {1},
year = {1977},
pages = { 151-163},
language = {en},
url = {http://dml.mathdoc.fr/item/1093887832}
}
Harper, Judith M.; Rubin, Jean E. Variations of Zorn's lemma, principles of cofinality, and Hausdorff's maximal principle. II. Class forms.. Notre Dame J. Formal Logic, Tome 18 (1977) no. 1, pp. 151-163. http://gdmltest.u-ga.fr/item/1093887832/