@article{IM_1993__111_1_144078,
     author = {Carolyn Gordon and D. DeTurck and H. Gluck},
     title = {The inaudible geometry of nilmanifolds.},
     journal = {Inventiones mathematicae},
     pages = {271--284},
     publisher = {mathdoc},
     volume = {111},
     number = {1},
     year = {1993},
     zbl = {0779.53026},
     url = {http://geodesic.mathdoc.fr/item/IM_1993__111_1_144078/}
}