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N. Garofalo and F. Tournier, “New Properties of Convex Functions in the Heisenberg Group,” Transactions of the American Mathematical Society, Vol. 358, No. 5, 2005, pp. 2011-2055.
http://dx.doi.org/10.1090/S0002-9947-05-04016-X

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.