(3GdefgL GdYdej hJaSjQ GdSdhc (B/ s - (3GSeGYjd, eMeO YeGO GdOjf, s ((3GdbGgQI (B[(3eUQ(B] : s (3ecJHI GdfgVI GdeUQjI (B970.s, 1970)
(3jJVef EQLGYGJ HHdjhLQGajI (B: (3UaMI (B248-251.s
Keywords: (3GdSdhc (B((3Yde faS(B).s; (3GdSdhcjIs -- (3LhGfH faSjI(B.s