(3Odjd GdWGdH Edi cdjGJ GdeLJeY GdCQOfjI (B: s (3OQGSI aj CfXeI h JYdjeGJ GdOQGSI (B/ s - (3MjGQi, YGjT SdGegs ((3YeGf (B:s (3GdeDda,s, 1990)
Keywords: (3GdcdjGJ GdeJhSWIs; (3GdCQOfs