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- [1] PORTFOLIO RETURNS AND RANDOM-WALK THEORY - COMMENT JOURNAL OF FINANCE, 1976, 31 (01): : 153 - 156
- [4] PORTFOLIO RETURNS AND RANDOM WALK THEORY - COMMENT JOURNAL OF FINANCE, 1973, 28 (03): : 733 - 741
- [6] ON MULTIPLE RETURNS IN THE RANDOM-WALK PROBLEM PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1954, 50 (04): : 586 - 591