May 20, 2007 ↑ Expulsion of Russian Spies Teaches Moscow a Needed Lesson by Stanislav Lunev, 22 March 2001 ↑ Alexander Kouzminov Biological Espionage: Special Operations of the Soviet and Russian Foreign Intelligence Services in the West, Greenhill Books, 2006, ISBN 1-85367-646-2 "Archived copy". Archived from the original on 2005-04-25. Retrieved 2005-04-25. ↑ Evan Perez; Shimon Prokupecz (8 April 2015).