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Received December 16, 1998; in final form April 6, 1999
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Bartsch, T., Chang, KC. & Wang, ZQ. On the Morse indices of sign changing solutions of nonlinear elliptic problems. Math Z 233, 655–677 (2000). https://doi.org/10.1007/s002090050492
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DOI: https://doi.org/10.1007/s002090050492