1. K. Niskanen, Ed., Paper Physics, Papermaking Science and Technology, vol. 16, Fapet, Jyväskylä, Finland, 1998.
2. The Encyclopedia of Money;Allen,2009
3. Not so funny funny-money: the threat of North Korean counterfeiting of U.S. currency;Corbett;Stevenson Univ. Forensics J.,2013
4. Will the new $100 bill decrease counterfeiting?;Green;Fed. Reserv. Bank Minneap. Q. Rev.,1996
5. Currency transactions costs and competing fiat currencies;Engineer;J. Int. Econ.,2000