@incollection{JEDP_1989____A17_0,
     author = {Hiroshi Isozaki},
     title = {Some remarks on the multi-dimensional {Borg-Levinson} theorem},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {17},
     pages = {1--6},
     publisher = {\'Ecole polytechnique},
     year = {1989},
     zbl = {0708.35094},
     mrnumber = {91m:35240},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1989____A17_0/}
}