The Minimum Number of Stocks Needed for Diversification,

Newbould, G.D., Poon P.S.


Financial Practice and Education, 1993, 3, 85-87.

source: http://elibrary.ru/item.asp?id=1874591

reprinted in Advances in Business Financial Management: A Collection of Readings, 2nd ed., Dryden Press, 1995, pp. 103-109.