Answers are grounded in this paper and cite their sources.
In the above titled paper (ibid., vol. 30, no. 4, pp. 632-646, Apr 08), there was an error in a definition. The correct definition is presented here.
No takes yet. Share an insight, caveat, or question.
Xie et al. (2008) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: