PT - JOURNAL ARTICLE AU - Edmond D. Villani TI - The Theoretical Challenge to Index Funds AID - 10.3905/jpm.1977.408624 DP - 1977 Oct 31 TA - The Journal of Portfolio Management PG - 46--51 VI - 4 IP - 1 4099 - https://pm-research.com/content/4/1/46.short 4100 - https://pm-research.com/content/4/1/46.full