PT - JOURNAL ARTICLE AU - J. Peter Williamson AU - Allen Silver TI - Sideways Betas AID - 10.3905/jpm.1976.408556 DP - 1976 Jan 31 TA - The Journal of Portfolio Management PG - 68--70 VI - 2 IP - 2 4099 - https://pm-research.com/content/2/2/68.short 4100 - https://pm-research.com/content/2/2/68.full