Lera, T.
| "Colorimetric Analysis of an Enhanced Cancel on a Mauritius 1d Stamp," Fakes Forgeries Experts, No. 14, April 2011, pp.103-104.
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Liston, E.M.
| "The 'China Clay' Variety of the 1908-1910 Washington-Franklin Issues?," The Collectors Club Philatelist, Vol. 84, No. 2, March-April 2005, pp. 105-112 and Vol. 84, No. 3, May-June 2005, pp. 141-146.
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