I've studied the HVZ theorem for the three body problem interacting with regular potentials. I'd like to extend this result to the three body problem with point interactions (delta potentials). Is there anyone who have studied this problem and knows some references about it?
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FewBody Systems 38, 125 (2006): On critical stability of three quantum charges interacting through delta potentials, H.D. Cornean, P. Duclos, B. Ricaud.


