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| $\delta$-interaction (1) |
| conical and hyperconical surfaces (1) |
| existence of bound states (1) |
| Schrödinger operator (1) |
| spectral asymptotics (1) |
| $\delta$-interaction (1) |
| conical and hyperconical surfaces (1) |
| existence of bound states (1) |
| Schrödinger operator (1) |
| spectral asymptotics (1) |