(3BaGb dG JMO(B: (3GdCab fOGA jSeYg GdebOGe hjbYO Ohfg GdeJNGPds - (3aDGO UQhas ((3dHfGfs (3OGQ GdYde ddedGjjf HjQhJs, 1958)
Keywords: Natural Sciences (3GdYdhe GdHMJIs