Annals of Pure and Applied LogicVolume 163, Issue 5, May 2012, Pages 483-484Computability in Europe 2009Author links open overlay panelKlaus Ambos-Spies, Arnold Beckmann, Samuel R. Buss, Benedikt LöweShow moreShareCitehttps://doi.org/10.1016/j.apal.2011.06.006Get rights and contentUnder an Elsevier user licenseopen archivePrevious article in issueNext article in issueRecommended articlesCited by (0)Copyright © 2011 Elsevier B.V. All rights reserved.