Complex projective space C{P_n} with the Fubini-Study metric, and the odd-dimensional constant curvature sphere {S
2n + 1} have recently been characterized by the spectrum of the Laplacian on 2-forms. In this paper, C{P_n} and {S
2n + 1} are characterized among the classes of compact Kaehler and Sasakian manifolds, respectively, by the spectrum of the Laplacian on p-forms for any fixed p.
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