Nakamura, Leonard Isamu. "Intangibles : What Put the New in the New Economy?," in Federal Reserve Bank of Philadelphia. "July/August 1999," Business Review (Federal Reserve Bank of Philadelphia) (July/August 1999) : 1-14. https://fraser.stlouisfed.org/title/5580/item/557707/toc/522278 , accessed on April 19, 2024.