@article{bwmeta1.element.bwnjournal-article-fmv35i1p4,
author = {Marston Morse},
title = {A positive, lower semi-continuous, non-degenerate function on a metric space},
journal = {Fundamenta Mathematicae},
volume = {35},
year = {1948},
pages = {47-78},
zbl = {0031.35601},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv35i1p4}
}
Morse, Marston. A positive, lower semi-continuous, non-degenerate function on a metric space. Fundamenta Mathematicae, Tome 35 (1948) pp. 47-78. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv35i1p4/