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ERRATA: Paper [EndrissGrandiCOMSOC2012]
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U. Endriss and U. Grandi. 
Graph Aggregation. 
Proc. 4th International Workshop on Computational Social Choice 
(COMSOC-2012), AGH University of Science and Technology, Krakow, 2012. 
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Fact 1, claiming that an aggregator is IIE if and only if it is both IIS 
and IIT, is wrong. Only one direction is corret: IIE implies both IIS and
IIT. For a correct statement, please refer to "Graph Aggregation" in the
journal Artificial Intelligence (2017).

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