Clark was NATO's supreme allied commander in 1999 during the military alliance's 11-week bombing campaign in Yugoslavia, which drove Serbian forces out of Kosovo.
His book, Waging Modern Warfare, gives a day-by-day account of the events from the command center.
A chapter allegedly dropped from the book at the insistence of the State Department reportedly quotes Milosevic as having said he knew Bosnian Serb General Ratko Mladic had planned atrocities in Srebrenica in 1995 but was unable to do anything about it.
"That would be a slam dunk in terms of the theory of command responsibility. The prosecution would like to show he knew it would happen or was aware atrocities were planned," Scharf said.
The UN court, known formally as the International Criminal Tribunal for the former Yugoslavia, was founded in 1993 to try political and military leaders responsible for atrocities in the Balkans since 1991.
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