(3bGd dj gDdGA (B/ s - (3GdgdGdj, YHO GdQRGb, s ((3HZOGO (B[(3GdYQGb(B] : s (3THcI GdeYQaI ddfTQ hGdJhRjY GdeMOhOI (B990.s, 1990)
(3jJVef GQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdTYQGA GdYQHs -- (3JQGLe(B.s; (3GdYQGbs -- (3GOHGAs -- (3JQGLe(B.s