1. One Trillion Dollars a Year! 4 (Fed. Reserve Bank of Philadelphia;Leonard Nakamura;see also M.M. Croes, Data for Intangibles in Selected OECD Countries,2000
2. Letter from Baruch Lev, Professor of Accounting and Finance;; Nakamura;The core works in this body of work were originally published in the 1980s and 1990s. See,2001