(3OQGSGJ aj GdJYGQV hGdJQLjM YfO GdCUhdjjf (B/s - (3YhV, GdSjO UGdMs ([(3O(B. (3e(B.] :s (3OGQ GdWdGFY GdeMeOjI,s, 1980)
Keywords: (3GdJQLjM (B((3CUhd abg(B)s; (3JYGQV GdCOdI (B((3CUhd Gdabg(B)s; (3GdMce (B((3CUhd Gdabg(B)s; (3CUhd Gdabg GdESdGejs