Theory of symmetric screening for solids and plasmas
  This paper has been withdrawn due to errors found by authors. A correct version of this paper is published in:   Tomasz M. Rusin, Wlodek Zawadzki, "Quantum theory of symmetric screening in the Hartree approximation", Phys. stat. sol. (b) 243, 1286-1295 (2006), DOI: 10.1002/pssb.200541204. 
Tomasz M. Rusin and Wlodek Zawadzki