(3bGfhf GdELQGAGJ GdLfGFjI eYdbG Ydjg HCMcGe GdfbV ef SfI (B1931 (3MJi SfI (B1987 (3hHGdJYdjeGJ GdYGeI ddfjGHGJ (B/s - (3YHO GdJhGH, eYhVs ((3GdEScfOQjI, eUQ (B:s (3efTBI GdeYGQa,s, 1987)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
Keywords: (3bGfhf GdELQGAGJ GdLfGFjIs -- (3eUQs; (3GdbGfhf GdLfGFjs -- (3eUQs