@article{1077311346,
author = {Lind, D. A.},
title = {A counterexample to a conjecture of Hopf},
journal = {Duke Math. J.},
volume = {42},
number = {1},
year = {1975},
pages = { 755-757},
language = {en},
url = {http://dml.mathdoc.fr/item/1077311346}
}
Lind, D. A. A counterexample to a conjecture of Hopf. Duke Math. J., Tome 42 (1975) no. 1, pp. 755-757. http://gdmltest.u-ga.fr/item/1077311346/