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Communicated by L. Collatz
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Bazley, N.W., Fox, D.W. Lower bounds to eigenvalues using operator decompositions of the form B*B. Arch. Rational Mech. Anal. 10, 352–360 (1962). https://doi.org/10.1007/BF00281201
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DOI: https://doi.org/10.1007/BF00281201