(3bGfhf Qbe (B10 (3dSfI (B1990 :s (3HTCf fRY edcjI GdYbGQGJ ddefaYI GdYGeI hdGFMJg GdJfajPjI (B/s - (3eUQ(B.s ((3GdbGgQI (B:s (3GdgjFI GdYGeI dTFhf GdeWGHY GdCejQjI,s, 1992)
Keywords: (3JTQjYGJ hbhGfjfs; (3GdYbGQGJ(B.s