You can not hear the mass of a homology class.
Gordon, C. ; Gluck, H. ; DeTurck ; D.
Commentarii mathematici Helvetici, Tome 64 (1989), p. 589-617 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1989-01-01
EUDML-ID : urn:eudml:doc:140173 
@article{GDZPPN002067374,
     title = {You can not hear the mass of a homology class.},
     journal = {Commentarii mathematici Helvetici},
     volume = {64},
     year = {1989},
     pages = {589-617},
     zbl = {0694.53037},
     url = {http://dml.mathdoc.fr/item/GDZPPN002067374}
}

Gordon, C.; Gluck, H.; DeTurck; D. You can not hear the mass of a homology class.. Commentarii mathematici Helvetici, Tome 64 (1989) pp. 589-617. http://gdmltest.u-ga.fr/item/GDZPPN002067374/