@article{SM_2021_212_7_a2,
     author = {S. A. Nazarov},
     title = {The preservation of threshold resonances and the splitting off of eigenvalues from the threshold of the continuous spectrum of quantum waveguides},
     journal = {Sbornik. Mathematics},
     pages = {965--1000},
     publisher = {mathdoc},
     volume = {212},
     number = {7},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2021_212_7_a2/}
}