Yellen: Permanecem Vulnerabilidades No Ambiente Global

Fed's Yellen says Policy Is Not on a Pre-Set Course

Fed's Yellen says Projections for fED Funds Rate are Not a fixed Plan for Future Policy

Brent Crude Futures Settle at $48.97/bbl, down 86 Cents, 1.73 Pct

Fed's Yellen says Investor Perceptions, Appetite for Risk can Change Abruptly