Reference Library - Infrared and FTIR
| Hanneman, W., and Hintze, R. | "Gum Characterization by Infrared Spectroscopy", The American Philatelist, Vol. 105, No. 9, September 1991, pp. 816-817. |
| Lera, T. | "In the National Postal Museum, Research: Scientific Equipment at the NPM", The Collectors Club Philatelist, Vol. 91, No. 3, May-June 2012, pp. 174-178. |
| Poslusny, M., and Daugherty, K.E. | "A Novel Approach to Looking at Stamps", The American Philatelist, Vol. 104, No. 8, August 1990, pp. 722-726. |