(3Gdchf GdCMOH(B: (3bUI GdfXQjI GdfSHjIs - (3YHOGdQMje HOQs; (3hdjO beMGhjs ((3dHfGfs (3OGQ GdYde ddedGjjf HjQhJs, 1962)
Keywords: Natural Sciences (3GdYdhe GdHMJIs