PT - JOURNAL ARTICLE AU - Bartley J. Madden TI - Structural Changes in Trading Stocks AID - 10.3905/jpm.1993.409467 DP - 1993 Oct 31 TA - The Journal of Portfolio Management PG - 19--27 VI - 20 IP - 1 4099 - https://pm-research.com/content/20/1/19.short 4100 - https://pm-research.com/content/20/1/19.full