(3TQM bGfhf VQjHI GdESJgdGc (B:s (3TQM JaUjdj dCMcGe GdbGfhf Qbe (B133 (3dSfI (B1988 (3HTCf VQjHI GdGSJgdGc hJYOjdGJg MJj (B1990 /s - (3YHOGdaJGM eQGOs ((3GdGScfOQjI (B:s (3OGQ GdacQ GdLGeYj(B,s, 1990)
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdVQGFHs; (3QbGHI eHGTQIs; (3GOGQI s; (3VQHjI GSJgdGcs; (3SdYs; (3eUdMI GdVQGFHs; (3bQGQGJ GOGQjIs