(3GdXGgQI GdELQGejI (B:s (3OQGSI JCUjdjI hJMdjdjI ai Gdabg GdeUQi hGdebGQf (B/s - (3YHOGdQMje UObis ((3GdbGgQI (B:s (3OGQ GdfUQ ddJhRjY hGdfTQ,s, 1989)
(3GdfU HGddZI GdYQHjIs
Keywords: (3Yde GdELQGes; (3GdbGfhf GdLfGFjs