Compactness of isospectral sets
Séminaire de théorie spectrale et géométrie, Tome S9 (1991), pp. 39-42. 
@article{TSG_1991__S9__39_0,
     author = {Brooks, Robert},
     title = {Compactness of isospectral sets},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {39--42},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {S9},
     year = {1991},
     language = {en},
     url = {http://www.numdam.org/item/TSG_1991__S9__39_0/}
}
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Brooks, Robert. Compactness of isospectral sets. Séminaire de théorie spectrale et géométrie, Tome S9 (1991), pp. 39-42. http://www.numdam.org/item/TSG_1991__S9__39_0/

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