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E. M. Harrell II and J. Stubbe, “On Trace Identities and Universal Eigenvalues Estimates for Some Partial Differential Operators,” Transactions of the American Mathematical Society, Vol. 349, No. 5, 1997, pp pp. 1797-1809. http://dx.doi.org/10.1090/S0002-9947-97-01846-1

has been cited by the following article:

• TITLE: Riesz Means of Dirichlet Eigenvalues for the Sub-Laplace Operator on the Engel Group

  AUTHORS: Jingjing Xue

  KEYWORDS: Engel Group; Sub-Laplace Operator; Eigenvalues; Riesz Mean

  JOURNAL NAME: Advances in Pure Mathematics, Vol.3 No.9B, December 24, 2013

  ABSTRACT: In this paper, we are concerned with the Riesz means of Dirichlet eigenvalues for the sub-Laplace operator on the Engel group and deriver different inequalities for Riesz means. The Weyl-type estimates for means of eigenvalues are given.