(3eSGgeI aj GYOGO GdOSJhQ GdOGFe hbGfhf GdGfJNGHGJ (B/ s - (3GdHSJGfj , YHO Gddg GSeGYjd s ((3HZOGO (B: s ( (3O(B. (3f (B) (3, s, 1961)
Keywords: (3bGfhf GdGfJNGHGJ s