(3GdfXGe GdOhdi hMbhb GdGfSGf ai GdhWf GdYQHi (B/ s - (3GdefXeI GdYQHjI dMbhb GdGfSGfs ((3GdbGgQI (B: s (3OGQ GdeSJbHd GdYQHi , s, 1990)
Keywords: (3Mbhb GdGfSGfs; (3GdMbhb GdeOfjIs; (3GdOhdIs