(3eUGOQ GdacQ GdYQHj aj GdGbJUGO aj GdYQGb (B/ s - (3MSjH, NjQ GdOjf, s ((3HjQhJ (B[(3dHfGf(B] : s (3OGQ GdWdjYI ddWHGYI hGdfTQ (B971.s, 1971)
(3jJVef GQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdYQGbs -- (3GMhGd GbJUGOjIs -- (3GdbQf (B20.s; (3GdYQGbs -- (3SjGSI GbJUGOjI(B.s