(3ebOeI dOQGSI GdTNUjI (B/ s - (3QjJTGQO dfs; (3GMeO eMeO YHOGdNGdbs ([S.N] : (3OGQ GdeYQaI GdLGeYjI , s, 1990)
Keywords: (3GdGfSGfs; (3Yde GdfaSs; (3GdTNUjIs; (3GdGOQGcs