(3TQM GMcGe YbO GdGjLGQ(B.s (3GdLRA GdGhd (B: s (3eY HMK NGU HbGfhf JfXje GjLGQ GdYbGQ Qbe (B67 (3dSfI (B1973 (3GdeYOd (B: (3OQGSI ebGQfI eYRRI HbQGQGJ eMceI JejjR GdYQGb (B/ s - (3GdhfOGhj, ceGd bGSe KQhJ, s ((3HZOGO (B[(3GdYQGb(B] : s (3eWHYI GhajJ GdhSGe (B976.s, 1976)
(3jJVef GQLGYGJ HHdjhLQGajI(B.s
Keywords: (3YbhO GdGjLGQs -- (3GdYQGb(B.s