(3GdVQQ GdCOHj heOi VeGfg ai Gdabg GdESdGej hGdbGfhf (B: s (3OQGSI ebGQfI (B/s - (3YHOGddg eHQhc GdfLGQ (B.s ((3GdbGgQI (B:s (3OGQ GdfgVI GdYQHjI,s, 1990)
Keywords: (3GdbGfhf GdeOfi(B.s; (3Mbhb GdedcjI GdacQjI (B. s; (3Mbhb GdJCdja hGdfTQ(B.s; (3GdCVQGQ(B.s