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Continue to ChatAsympotics of number of negative eigenvalues relative to small parameter of even order operator equation - https://avesis.yildiz.edu.tr/publication/details/6d4ab36f-c6e0-4934-9a1e-92e1146e5502/asympotics-of-number-of-negative-eigenvalues-relative-to-small-parameter-of-even-order-operator-equation