@article{1093636771,
author = {Zuckerman, Martin M.},
title = {Sums of finitely many ordinals of various kinds.},
journal = {Notre Dame J. Formal Logic},
volume = {27},
number = {1},
year = {1986},
pages = { 572-578},
language = {en},
url = {http://dml.mathdoc.fr/item/1093636771}
}
Zuckerman, Martin M. Sums of finitely many ordinals of various kinds.. Notre Dame J. Formal Logic, Tome 27 (1986) no. 1, pp. 572-578. http://gdmltest.u-ga.fr/item/1093636771/