Geodesic
The theory of extentions and zero-radius potentials with internal structure
Sbornik. Mathematics, Tome 65 (1990) no. 1, pp. 147-184

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A detailed spectral analysis is carried out for the Schrödinger operator with zero-radius potentials endowed with internal structure. Explicit expressions are obtained for the resolvents and spectral projections in the case when the internal operators are compact. The corresponding scattering problem is solved. Bibliography: 22 titles. 
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B. S. Pavlov; A. A. Shushkov. The theory of extentions and zero-radius potentials with internal structure. Sbornik. Mathematics, Tome 65 (1990) no. 1, pp. 147-184. http://geodesic.mathdoc.fr/item/SM_1990_65_1_a8/