(3Gdebdb (B/ s - (3GHf GdLhRj, CHj GdaQLs; (3GdSjO, eLOj aJMj s ((3WfWG (B: s (3OGQ GdUMGHg ddJQGK, s, 1991)
Keywords: (3GdMOjK GdTQja(B.s; (3GdESdGe(B. s