@article{01549698,
title = {Curve shortening flow and the Banchoff-Pohl inequality on surfaces of nonpositive curvature.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {40},
year = {1999},
pages = {203-215},
zbl = {0976.53062},
language = {en},
url = {http://dml.mathdoc.fr/item/01549698}
}
Süssmann, Bernd. Curve shortening flow and the Banchoff-Pohl inequality on surfaces of nonpositive curvature.. Beiträge zur Algebra und Geometrie, Tome 40 (1999) pp. 203-215. http://gdmltest.u-ga.fr/item/01549698/