@article{bwmeta1.element.bwnjournal-article-smv27i1p20bwm,
author = {Israel Halperin},
title = {Extension of the rank function},
journal = {Studia Mathematica},
volume = {27},
year = {1966},
pages = {325-335},
zbl = {0148.26102},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv27i1p20bwm}
}
Halperin, Israel. Extension of the rank function. Studia Mathematica, Tome 27 (1966) pp. 325-335. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv27i1p20bwm/