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QUANTUM GRAPHS WITH SUMMABLE MATRIX POTENTIALS Статья Granovskyi Y.I., Malamud M.M., Neidhardt H. Doklady Mathematics. Том 100. 2019. С. 405-410
A TRACE FORMULA FOR FUNCTIONS OF CONTRACTIONS AND ANALYTIC OPERATOR LIPSCHITZ FUNCTIONS Статья Malamud M., Peller V., Neidhardt H. Comptes Rendus Mathematique. Elsevier Masson SAS. Том 355. 2017. С. 806-811