Some remarks on the multi-dimensional Borg-Levinson theorem
Journées équations aux dérivées partielles (1989), article no. 17, 6 p. 
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     author = {Isozaki, Hiroshi},
     title = {Some remarks on the multi-dimensional {Borg-Levinson} theorem},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {17},
     pages = {1--6},
     publisher = {Ecole polytechnique},
     year = {1989},
     mrnumber = {91m:35240},
     zbl = {0708.35094},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1989____A17_0/}
}
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Isozaki, Hiroshi. Some remarks on the multi-dimensional Borg-Levinson theorem. Journées équations aux dérivées partielles (1989), article  no. 17, 6 p. http://archive.numdam.org/item/JEDP_1989____A17_0/

[1] Borg, G., Acta. Math. 78, 1-96, 1946. | MR | Zbl

[2] Levinson, N-, Mat. Tidsskr. B. 1949, 25-30, 1949. | Zbl

[3] Pöschel - Trubowitz, Inverse Spectral Theory, Academic Press. | Zbl

[4] Nachman. A., Sylvester J., Vhlmann. G., Commun. Math. Phys. 115, 595-605, 1988. | Zbl