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Referee decisionThe present article has been refereed after the prescribed three-month discussion period. In the opinion of the referee group, the article is useful as a general introduction to the author's approach, which is recognized as a leading one in the field. However, the paper in itself does not have the concise technical contents that are expected for being accepted to the ETAI. In line with ETAI policy, the article does have published status, so it continues to be citable, and the discussion about it will continue to be available. Comments and questions by one of the anonymous referees have been added to the on-line discussion about the article. | ||