@article{MZ_1993__214_1_174580,
     author = {V. Bach and R. Lewis and E.H. Lieb},
     title = {On the number of bound states of a bosonic {N-particle} {Coulomb} system.},
     journal = {Mathematische Zeitschrift},
     pages = {441--460},
     publisher = {mathdoc},
     volume = {214},
     number = {1},
     year = {1993},
     zbl = {0852.47036},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174580/}
}