(3abI GdfSGA ai GdMjV (B0(3GdGSJMGVI (B0 (3GdfaGS (B0 (3GdSbW (B0 (3GdhdGOI GdLQGMjIs ([S.N] : (3ecJHI GdJQGK GdGSdGei , s, 1990)