@incollection{JEDP_1989____A17_0, author = {Isozaki, Hiroshi}, 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}, mrnumber = {91m:35240}, zbl = {0708.35094}, language = {en}, url = {http://archive.numdam.org/item/JEDP_1989____A17_0/} }