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Results obtained at the Courant Institute of Mathematical Sciences, New York University, with the National Science Foundation, Grant NSF-GP-37069X.
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Cheng, SY. Eigenfunctions and nodal sets. Commentarii Mathematici Helvetici 51, 43–55 (1976). https://doi.org/10.1007/BF02568142
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DOI: https://doi.org/10.1007/BF02568142