(3GdLQGFe GdeVQI HGdeUdMI GdYGeI aj GdbGfhf GdeUQj (B/s - (3aJhM YHO Gddg GdTGPdjs ((3GdGScfOQjI (B:s (3GdecJH GdLGeYj GdMOjK ,s, 1991)
. 427-417(3HHdjhLQGajG(B: (3UaMGJ(B.s
(3jTJed Ydi EQLGYGJ HHdjhLQGajIs
Keywords: z; (3bGfhf GdYbhHGJ GdbSe GdNGUs