(3HQeLI HjSc ddeHJOFjfs - (3efUhQ(B. (3YhVs ((3ecJHI cJGajs (3GQHO(B((3GdGQOf(B)s, 1987)
Keywords: (3GdceHjhJQs; (3GdMGSHGJ GdGdcJQhfjIs