(3ehShYI abg SajGf GdKhQj (B/ s - (3bdYI Lj, eMeO QhGSs ((3HjQhJ (B:s (3OGQ GdfaGFS ddWHGYI h GdfTQ h GdJhRjY,s, 1990)
Keywords: (3GdESdGes; (3Gdabg GdESdGejs