(3GdRef GdUYH (B((3TQGFW ajOjh(B) / s - (3eMeO MSjHs ((3GdbGgQI (B: s (3GdfShQ ddGfJGL Gdafi , s, 1990)
Keywords: (3GdGadGe GdSjfeGFjIs; (3GdGadGe GdYQHjIs; (3GdGadGe GdGLJeGYjIs; (3GdajOjh, CTQWIs