(3GdTaGA GdWHjYGJ (B: s 1- (3GdSeGY GdWHjYi (B/ s - (3SYjO RGjO (B((3eMbb(B)s; (3GHQGgje eOchQs ((3GdbGgQI (B: s (3GdgjFI GdeUQjI GdYGeI ddcJGH , s, 1970)
Keywords: (3GdJQGKs; (3GdJQGK GdGSdGeis; (3GdYdhe YfO GdYQHs; (3GdJGQjN GdWHjYis; (3GdMVGQI GdGSdGejIs