TY - JOUR ID - 10442/6977 A1 - Nicolaides, C. A. A1 - A1 - Beck, D. R. Y1 - 1976/// T1 - Collective Excitations in Atoms and Molecules JF - Journal of Physics B: Atomic, Molecular and Optical Physics VL - 9 IS - 10 SN - 0953-4075 U3 - 10.1088/0022-3700/9/10/002 PB - Institute of Physics Publishing SP - L259–L263EP - UR - https://hdl.handle.net/10442/6977 ER -