PT - JOURNAL ARTICLE AU - William F. Sharpe AU - Allan Silver TI - “Sideways Betas” AID - 10.3905/jpm.1976.408576 DP - 1976 Jul 31 TA - The Journal of Portfolio Management PG - 67--68 VI - 2 IP - 4 4099 - https://pm-research.com/content/2/4/67.short 4100 - https://pm-research.com/content/2/4/67.full