@article{AA_2020_32_6_a0,
     author = {F. L. Bakharev and S. A. Nazarov},
     title = {Criteria for the absence and existence of bounded solutions at the threshold frequency in a junction of quantum waveguides},
     journal = {Algebra i analiz},
     pages = {1--23},
     publisher = {mathdoc},
     volume = {32},
     number = {6},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2020_32_6_a0/}
}