@article{1077473488,
author = {Morse, Marston},
title = {The topology of pseudo-harmonic functions},
journal = {Duke Math. J.},
volume = {13},
number = {1},
year = {1946},
pages = { 21-42},
language = {en},
url = {http://dml.mathdoc.fr/item/1077473488}
}
Morse, Marston. The topology of pseudo-harmonic functions. Duke Math. J., Tome 13 (1946) no. 1, pp. 21-42. http://gdmltest.u-ga.fr/item/1077473488/