A new example of an isospectrally deformable solvmanifold and the geometry of the deformation
Séminaire de théorie spectrale et géométrie, Tome S9 (1991), pp. 129-131. 
@article{TSG_1991__S9__129_0,
     author = {Sch\"uth, Dorothee},
     title = {A new example of an isospectrally deformable solvmanifold and the geometry of the deformation},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {129--131},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {S9},
     year = {1991},
     language = {en},
     url = {http://archive.numdam.org/item/TSG_1991__S9__129_0/}
}
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Schüth, Dorothee. A new example of an isospectrally deformable solvmanifold and the geometry of the deformation. Séminaire de théorie spectrale et géométrie, Tome S9 (1991), pp. 129-131. http://archive.numdam.org/item/TSG_1991__S9__129_0/

[GW] Gordon, Wilson. - Isospectrat deformations if compact solvmanifolds, J. Diff. Geom., 19 ( 1984), 241-256. | MR | Zbl

[DGGW1] Deturck, Gluck, Gordon, Webb. - You can't hear the mass of a homology class,Comm. Math. HeIv.. | Zbl

[DGGW2] Deturck, Gluck, Gordon, Webb. - The inaudible geometry of nilmanifolds, Preprint, (and the other preprints by the same authors). | Zbl