Multipoint scatterers with zero-energy bound states
  We study multipoint scatterers with zero-energy bound states in three dimensions. We present examples of such scatterers with multiple zero eigenvalue or with strong multipole localization of zero-energy bound states. 
P.G. Grinevich (1), R.G. Novikov (2) ((1) L.D. Landau Institute for   Theoretical Physics RAS, Chernogolovka, Moscow region,...
math-ph math.MP math.SP