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Received: 13 April 1995 / Revised version: 6 March 1996
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Grunau, HC., Sweers, G. Positivity for equations involving polyharmonic operators with Dirichlet boundary conditions . Math Ann 307, 589–626 (1997). https://doi.org/10.1007/s002080050052
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DOI: https://doi.org/10.1007/s002080050052