00286nam a2200109 a 450000500170000000800410001704100080005810000160006624500370008226400490011930000080016820260717100938.0260717s1996    ii            000 0 eng d  aeng1 aWehr, M. R.10aPhysics of the Atom /cWehr, M.R 1anew Delhi :bNarosa Publishing House,c1996.  a593