(3TQM bGfhf GdYbhHGJ GdbSe GdNGU (B/s - (3BeGd YHO GdQMje YKeGfs ((3GdbGgQI (B:s [(3ZjQ eMOO(B](3,s, 1989)
(3GdLQGFe GdeNdI HGdEOGQI GdYGeI (B- (3GdLQGFe GdeNdI HGdKbI GdYGeI (B- (3LQGFe GdLeQcjIs
(3jTJed Ydi GQLGYGJ HHdjhLQGajI(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3bGfhf GdYbhHGJ (B- (3GdbSe GdNGUs