(3GdVGHWI GdYOdjI (B: s (3YdGbJgG HGdbVGA hOhQgG aj SjQ GdYOGdI GdLRGFjI (B: (3OQGSI ebGQfI (B/ s - (3TMGOI, jhSa s ((3HjQhJ (B: s (3eDSSI HMShf ddfTQ hGdJhRjY,s, 1999)
(3HHdjhLQGajI (B: (3U(B. 499-510. s
Keywords: (3GdVHW GdbVGFj s -- (3dHfGf s; (3bGfhf GdELQGAGJ GdLfGFjI s -- (3dHfGf s