@article{MAN_1985__273_164070,
     author = {Victor Guillemin and Alejandro Uribe},
     title = {Clustering {Theorms} with {Twisted} {Spectra.}},
     journal = {Mathematische Annalen},
     pages = {479--506},
     publisher = {mathdoc},
     volume = {273},
     year = {1985},
     zbl = {0591.58031},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__273_164070/}
}