PT - JOURNAL ARTICLE AU - Bill McDonald TI - Making sense out of unstable alphas and betas AID - 10.3905/jpm.1985.408995 DP - 1985 Jan 31 TA - The Journal of Portfolio Management PG - 19--22 VI - 11 IP - 2 4099 - https://pm-research.com/content/11/2/19.short 4100 - https://pm-research.com/content/11/2/19.full