NON-COMPACT QUANTUM GRAPHS WITH SUMMABLE MATRIX POTENTIALS Article Granovskyi Y., Malamud M., Neidhardt H. Annales Henri Poincare. Birkhauser Verlag AG. Vol. 22. 2021.
QUANTUM GRAPHS WITH SUMMABLE MATRIX POTENTIALS Article Granovskyi Y.I., Malamud M.M., Neidhardt H. Doklady Mathematics. Vol. 100. 2019. P. 405-410