With this issue we confirm the acceptance of two submitted reference articles: the one by Michael Thielscher and the one by Michael Gelfond and Vladimir Lifschitz.

For Thielscher's article we had an animated discussion between the two referees some time ago. No additional contribution has arrived for that debate, and an analysis of the arguments and the article led to the conclusion that the article should be accepted without reservations, although with an option for the author to revise the article in order to take some of the referee suggestions into account.

For the article by Gelfond and Lifschitz the two anonymous referees have made some remarks, but no suggestions for changes. The article is accepted without reservations.

Additional debate contributions have been received for the following article(s). Please click the title of the article to link to the interaction page, containing both new and old contributions to the discussion.

Michael Gelfond and Vladimir Lifschitz
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