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- [4] COMPARISON OPERATORS FOR LOWER BOUNDS TO EIGENVALUES JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1966, 223 (AUG): : 142 - &
- [9] Upper bounds to the eigenvalues of the no-pair Hamiltonian PHYSICAL REVIEW A, 1997, 55 (03): : 1781 - 1784