International Katyn Commission (30 April 1943). "Commission Findings". Transcript, Smolensk 30 April 1943. Warsaw Uprising by Project InPosterum. Archived from the original on 3 March 2016. Retrieved 15 November 2013.
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International Katyn Commission (30 April 1943). "Commission Findings". Transcript, Smolensk 30 April 1943. Warsaw Uprising by Project InPosterum. Archived from the original on 3 March 2016. Retrieved 15 November 2013.