Abstract
We would like to thank our colleagues Roberto Asin, Edmund K. Burke, John H. Drake, Marco Lubbecke, Barry McCollum, Ender Ozcan and Andrea Schaerf for their careful reading and their insightful comments, and Miguel A. Goberna for inviting us to contribute to TOP. Most of the discussants remarks (referring to a preliminary version of our paper) have been included in the new version, leading to an improved overview of the topic. In the following, we wish to make some considerations about their comments.
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