Media type: E-Article Title: RPA Collective Excitations in the Two‐Dimensional Fermion Systems Contributor: Czachor, A.; Holas, A. Published: Wiley, 1981 Published in: physica status solidi (b), 108 (1981) 1 Language: English DOI: 10.1002/pssb.2221080142 ISSN: 0370-1972; 1521-3951 Keywords: Condensed Matter Physics ; Electronic, Optical and Magnetic Materials Origination: Footnote: