(3GdbQGQGJ GdJfajPjI ddbGfhf Qbe (B21 (3dSfI (B1958 (3HTCf JfXje GdUfGYI hJTLjYgG (B:s (3GdLRA GdKGdK (B/s - (3eUQ(B.s ((3GdbGgQI (B:s (3GdgjFI GdYGeI dTFhf GdeWGHY GdCejQjI,s, 1990)
Keywords: (3JTQjYGJ hbhGfjfs; (3JfXje GdUfGYI(B.s