(3eYLe Mceg GdYQH (B: s (3Cge GdMce GdYQHjI GdNGdOg eQJHg aj ehVhYGJ (B/ s - (3Tdb, Ceds ((3HjQhJ (B:s (3OGQ GdcJH GdYdejg,s, 1991)
Keywords: (3GdMce(B((3GdCeKGd(B)s; (3GdbhGejSs