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- ItemPoint contacts and boundary triples(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2014) Lotoreichik, Vladimir; Neidhardt, Hagen; Popov, Igor Yu.We suggest an abstract approach for point contact problems in the framework of boundary triples. Using this approach we obtain the perturbation series for a simple eigenvalue in the discrete spectrum of the model self-adjoint extension with weak point coupling.