@article{TMF_2017_193_2_a6,
     author = {P. G. Grinevich and R. G. Novikov},
     title = {Multipoint scatterers with bound states at zero energy},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {309--314},
     publisher = {mathdoc},
     volume = {193},
     number = {2},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2017_193_2_a6/}
}