The inaudible geometry of nilmanifolds. Carolyn Gordon; D. DeTurck; H. Gluck — 1993 Inventiones mathematicae
You can not hear the mass of a homology class. C. Gordon; H. Gluck; DeTurck; D. — 1989 Commentarii mathematici Helvetici
Calibrated geometries in Grassmann manifolds. W. Ziller; H. Gluck; F. Morgan — 1989 Commentarii mathematici Helvetici