@article{NANO_2013_4_2_a0,
     author = {V. Yu. Lotoreichik},
     title = {Note on {2D} {Schr\"odinger} operators with $\delta$-interactions on angles and crossing lines},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {166--172},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2013_4_2_a0/}
}