@article{MAN_1974__207_162536,
     author = {Barry Simon},
     title = {Absence of {Positive} {Eigenvalues} in a {Class} of {Multiparticle} {Quantum}   {Systems.}},
     journal = {Mathematische Annalen},
     pages = {133--138},
     publisher = {mathdoc},
     volume = {207},
     year = {1974},
     zbl = {0253.35025},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__207_162536/}
}