(3GdeONd ddYdhe GdbGfhfjI (B: s ((3GdfXQjI GdYGeI ddbGfhf(B) / s - (3aQL, Jhajb MSf, s ([(3GdbGgQI, eUQ(B] : s (3GdOGQ GdLGeYjI (B990.s, 1990)
(3jJVef GQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdbGfhf(B.s; (3fXQjI GdMb(B.s; (3GdbGfhfs -- (3adSaI(B.s