1. M. A. Antonets, G. M. Zhislin, I. A. Shereshevskii, “On the infiniteness of the discrete spectrum of the energy operator of a system of $n$ particles”, Math. USSR-Sb., 28:1 (1976), 27–39  mathnet  crossref  mathscinet  zmath  isi
  2. I. M. Sigal, “On the point spectrum of the Schrödinger operators of multiparticle systems”, Commun.Math. Phys., 48:2 (1976), 155  crossref
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