On the minimum number of distinct eigenvalues in the problem for a tree formed by Stieltjes strings von V. M. Pyvovarchyk

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Upper bound for the diameter of a tree in the quantum graph theory von O. P. Boiko, O. M. Martyniuk, V. M. Pyvovarchyk

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On the relationship between the multiplicities of eigenvalues in finite- and infinite-dimensional problems on graphs von O. P. Boiko, O. M. Martyniuk, V. M. Pyvovarchyk

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