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• Inequalities and Separation for a Biharmonic Laplace-Beltrami Differential Operator in a Hilbert Space Associated with the Existence and Uniqueness Theorem

  Elsayed M. E. Zayed

  2016-03-05

  44596 3716 Pages:59-70

• An Algebraic Approach for Extending Hamiltonian Operators

  Tu Guizhang, Ma Wenxiu

  1992-05-01

  40583 3806 Pages:43-56