@inproceedings{Tonchev:2008d7, author = "Tonchev, Anton P.", title = "{Missing dipole excitation strength below the particle threshold}", doi = "10.22323/1.044.0017", booktitle = "Proceedings of Workshop on Photon Strength Functions and Related Topics {\textemdash} PoS(PSF07)", year = 2008, volume = "044", pages = "017" }