On the bounds of the sum of eigenvalues for a Dirichlet problem involving mixed fractional Laplacians

@article{Chen2020OnTB,
  title={On the bounds of the sum of eigenvalues for a Dirichlet problem involving mixed fractional Laplacians},
  author={Huyuan Chen and Mousomi Bhakta and Hichem Hajaiej},
  journal={Journal of Differential Equations},
  year={2020}
}

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