@article{TMF_1995_105_1_a0,
     author = {Yu. G. Shondin},
     title = {About semiboundness of $\delta$-perturbations of the {Laplacian} supported by curves with angle points},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {3--17},
     year = {1995},
     volume = {105},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1995_105_1_a0/}
}