Stocks delivered a disturbing signal last week. Here’s what it may mean. MarketWatchS&P 500, Nasdaq Technicals Bearish; Russell 2000 Needs to Avoid Gap-Down Opening Investing.comThis Is the Kind of Market Structure We Usually See Before Corrections TheStreet2 Major Reversal Patterns S&P 500 Bulls Will Look to Avoid This Week Investing.comWhere’s the Market Headed Next? Let’s Weigh the Evidence TheStreet