@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/