1. Stocks Are Facing Both Earnings Headwinds and a Compression in the P/E Ratiohttps://www.cnbc.com/2022/01/24/stocks-are-facing-both-earnings-headwinds-and-a-compression-in-the-p/e-ratio.html
2. Is SPY ETF a Buy or Sell as the Market Dips?https://seekingalpha.com/article/4489911-spy-etf-buy-sell-market-dips?mailingid=26829447
3. The S&P 500 in the Years of Rate Hikeshttps://seekingalpha.com/article/4491558-the-s-and-p-500-in-the-years-of-rate-hikes
4. Crisis risk prediction with concavity from Polymodel
5. What Is a Bear Market?https://www.investopedia.com/terms/b/bearmarket.asp