1. Crompton, C. and Gall, D. Georgi Markov – death in a pellet. Med. Leg. J. 48, 51–62, 1980.
2. Schier, J. G., Patel, M. M., Belson, M. G., et al. Public health investigation after the discovery of ricin in a South Carolina post office. Am. J. Public Health 97, S152–S157, 2007.
3. CBS News.com. Feds plead for ricin leads. Available at < http://www.cbsnews.com/stories/2003/10/23/national/main579600.shtml> Accessed January 10, 2004.
4. CNN.com. Early tests show deadly ricin in Senate mailroom. Available at < http://www.cnn.com/2004/US/02/02/senate.hazardous/> Accessed February 3, 2004.
5. WHO TV News. Women accused in plot to poison husband with ricin. Available at < http://www.whotv.com/Global/story.asp?S=1594218> Accessed January 10, 2004.