@article{GDZPPN002069709,
title = {The marked length spectrum vs. the Laplace spectrum on forms on Riemannian nilmanifolds.},
journal = {Commentarii mathematici Helvetici},
volume = {71},
year = {1996},
pages = {297-329},
zbl = {0861.58043},
url = {http://dml.mathdoc.fr/item/GDZPPN002069709}
}
Gornet, Ruth. The marked length spectrum vs. the Laplace spectrum on forms on Riemannian nilmanifolds.. Commentarii mathematici Helvetici, Tome 71 (1996) pp. 297-329. http://gdmltest.u-ga.fr/item/GDZPPN002069709/