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References
- ↑ Holdsworth, Nick (23 March 2013). "Prime suspect in Georgi Markov "umbrella poison" murder tracked down to Austria". The Daily Telegraph. London.
- ↑ Richard Edwards, Crime Correspondent (19 June 2008). "Poison-tip umbrella assassination of Georgi Markov reinvestigated". The Daily Telegraph. London.
{{cite web}}:|author=has generic name (help) - ↑ "How an assassin bungled a deadly umbrella plot". The Independent. London. 16 August 2013.
- ↑ "Bulgarian umbrella – Gadgets Now". Gadget Now.