@article{Nicolaides_Beck_1976, title={Collective Excitations in Atoms and Molecules}, volume={9}, ISSN={0953-4075}, archiveLocation={Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο}, url={https://hdl.handle.net/10442/6977}, DOI={10.1088/0022-3700/9/10/002}, number={10}, journal={Journal of Physics B: Atomic, Molecular and Optical Physics}, publisher={Institute of Physics Publishing}, author={Nicolaides, Cleanthes A. and Beck, D. R.}, year={1976}, pages={L259–L263} }