@article{KuemmelAndraeReinhard2001, author = {S. K{\"u}mmel and Karsten Andrae and P.-G. Reinhard}, title = {Collectivity in the optical response. of small metal clusters}, journal = {Applied Physics B}, volume = {73}, number = {4}, pages = {293 -- 297}, url = {http://dx.doi.org/10.1007/s003400100679}, year = {2001}, }