(3GdeLdI GdGLJeGYjI GdbhejI(B.s (3jfGjQ (B1972 /s ((3GdbGgQI (B:s (3GdeQcR Gdbhej ddHMhK GdGLJeGYjI hGdLfGFjI,s, 1972)
(3GdBKGQ GdeJQJHI Ydi MPa GdGNJHGQGJ aj GdJTHYGJ GdYGedjI (B/s (3O(B. (3aDGO GdHgj(B.s
(3GdeLdO GdJGSY(B: (3GdYOO GdChd(B.s
Keywords: (3bhGfjf hJTQjYGJs -- (3OhQjGJs