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Vanevi?, M. (author), Nazarov, Y.V. (author), Belzig, W. (author)We determine charge-transfer statistics in a quantum conductor driven by a time-dependent voltage and identify the elementary transport processes. At zero temperature unidirectional and bidirectional single-charge transfers occur. The unidirectional processes involve electrons injected from the source terminal due to excess dc bias voltage. The...journal article 2008