@article{NANO_2017_8_2_a0,
     author = {S. Albeverio and S. Fassari and F. Rinaldi},
     title = {The behaviour of the three-dimensional {Hamiltonian} $-\Delta+\lambda[\delta(x+x_0)+\delta(x-x_0)]$ as the distance between the two centres vanishes},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {153--159},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2017_8_2_a0/}
}