(3fbO GdYbd GdYQHi (B: s (3eL (B1 (3Jchjf GdYbd GdYQHi (B: (3eL (B2 (3HfjI GdYbd GdYQHi (B: (3eL (B3 (3GdYbd GdSjGSi GdYQHi (B/ s - (3eMeO YGHO GdLGHQis ((3HjQhJ (B: s (3GdeQcR GdKbGai GdYQHi , s, 1991)
Keywords: (3GdKbGaI GdGSdGejIs; (3GdKbGaI GdYQHjIs; (3fXQjI GdMce aiGdGSdGes; (3GdSHHjIs; (3GdGSdGe hGdSjGSIs; (3GdJbOe GdMVGQis