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@article{CMH_1980__55_139837, author = {Ruishi Kuwabara}, title = {On the characterizations of flat metrics by the spectrum.}, journal = {Commentarii mathematici Helvetici}, pages = {427--444}, publisher = {mathdoc}, volume = {55}, year = {1980}, zbl = {0448.58027}, url = {http://geodesic.mathdoc.fr/item/CMH_1980__55_139837/} }
Ruishi Kuwabara. On the characterizations of flat metrics by the spectrum.. Commentarii mathematici Helvetici, Tome 55 (1980), pp. 427-444. http://geodesic.mathdoc.fr/item/CMH_1980__55_139837/