[{"publisher":"Lehigh University","type":"article","author":"McKean, Henry P. and Singer, Isadore M.","title":"Curvature and the eigenvalues of the Laplacian","pages":"43--69","number":"1-2","id":"MS67","journal":"Journal of Differential Geometry","volume":"1","year":"1967"},{"publisher":"Springer","type":"book","id":"JC19","author":"Conway, John B.","title":"A course in functional analysis","volume":"96","year":"2019"},{"type":"article","author":"Conway, John H and Sloane, N. J. A.","title":"Four-dimensional lattices with the same theta series","pages":"93--96","id":"CS92","journal":"Internat. Math. Res. Notices","volume":"4","year":"1992"},{"type":"article","author":"Datchev, Kiril and Hezari, Hamid","title":"Inverse problems in spectral geometry","pages":"455--486","id":"DH11","journal":"Inverse problems and applications: Inside Out II","volume":"60","year":"2011"},{"publisher":"American Mathematical Soc.","type":"book","id":"FBZ04","author":"Frenkel, Edward and Ben-Zvi, David","title":"Vertex algebras and algebraic curves","volume":"88","year":"2004"},{"date":"2023-09-01","type":"online","id":"TF17","author":"Franke, Tobias","title":"Triple prod\\-uct inte\\-grals","url":"https://www.tobias-franke.eu/log/2017/04/19/triple-products.html"},{"type":"article","author":"Gordon, Carolyn","title":"Isospectral closed Riemannian manifolds which are not locally isometric","pages":"639--649","number":"3","id":"CG93","journal":"Journal of Differential Geometry","volume":"37","year":"1993"},{"type":"article","author":"Guillemin, Victor and Kazhdan, David","title":"Some inverse spectral results for negatively curved n-manifolds","pages":"301--312","id":"GK80","journal":"Proceedings of Symposia in Pure Math","volume":"36","year":"1980"},{"publisher":"Springer Berlin Heidelberg","type":"article","author":"Hörmander, Lars","title":"The spectral function of an elliptic operator","pages":"217--242","id":"LH68","journal":"Mathematics Past and Present Fourier Integral Operators","year":"1968"},{"publisher":"Princeton University Press","type":"book","id":"AK01","author":"Knapp, Anthony W","title":"Representation theory of semisimple groups: an overview based on examples","year":"2001"},{"type":"online","author":"Lu, Jianfeng and Steinerberger, Stefan","title":"On pointwise products of elliptic eigenfunctions","archivePrefix":"arXiv","id":"LS18","eprint":"1810.01024","year":"2018"},{"type":"article","author":"Milnor, John","title":"Eigenvalues of the Laplace operator on certain manifolds","pages":"542--542","number":"4","id":"JM64","journal":"Proceedings of the National Academy of Sciences","volume":"51","year":"1964"},{"type":"article","author":"Nilsson, Erik and Rowlett, Julie and Rydell, Felix","title":"The isospectral problem for flat tori from three perspectives","pages":"39--83","number":"1","id":"NRR22","journal":"Bulletin of the American Mathematical Society","volume":"60","year":"2023"},{"publisher":"Elsevier","type":"book","id":"RS75","author":"Reed, Michael and Simon, Barry","title":"Methods of modern mathematical physics II: Fourier analysis, self-adjointness","volume":"2","year":"1975"},{"type":"article","author":"Sarnak, Peter","title":"Integrals of products of eigenfunctions","pages":"251--260","id":"PS94","journal":"IMRN","volume":"6","year":"1994"},{"publisher":"Bonner Mathe\\matische Schriften","type":"phdthesis","author":"Schiemann, Alexander","title":"Ternäre positiv definite quad\\-ratische Formen mit gleichen Darstellungs\\-zahlen","school":"Universität Bonn","id":"AS94","volume":"268","year":"1993"},{"type":"article","author":"Sunada, Toshikazu","title":"Riemannian coverings and isospectral manifolds","pages":"169--186","number":"1","id":"TS85","journal":"Annals of Mathematics","volume":"121","year":"1985"},{"type":"article","author":"Tanno, Shukichi","title":"A characterization of the canonical spheres by the spectrum","pages":"267--274","number":"3","id":"ST80","journal":"Math. Z.","volume":"175","year":"1980"},{"publisher":"Springer Science \\& Business Media","type":"book","id":"MT13","author":"Taylor, Michael","title":"Partial differential equations II: qualitative studies of linear equations","volume":"116","year":"2013"},{"type":"article","author":"Weyl, Hermann","title":"Über die asymp\\-totische Ver\\-teilung der Eigen\\-werte","pages":"110--117","id":"HW11","journal":"Nach\\-richten der König\\-lichen Gesell\\-schaft der Wissen\\-schaften zu Göttingen","year":"1911"},{"type":"article","author":"Wyman, Emmett L","title":"Triangles and triple products of Laplace eigenfunctions","number":"8","doi":"https://doi.org/10.1016/j.jfa.2022.109404","id":"EW22","journal":"Journal of Functional Analysis","year":"2022","volum":"282"},{"type":"article","author":"Zhou, Gengqiang","title":"Compactness of isospectral compact manifolds with bounded curvatures","pages":"187--200","number":"1","id":"GZ97","journal":"Pacific J. Math","volume":"181","year":"1997"},{"type":"online","author":"Adve, Anshul","title":"A converse theorem for hyperbolic surface spectra and the conformal bootstrap","doi":"https://doi.org/10.48550/arXiv.2509.17935","archivePrefix":"arXiv","id":"AA25","eprint":"2509.17935","year":"2025"}]