@inproceedings{FlarupHansenMeer2009, author = {Uffe Flarup Hansen and Klaus Meer}, title = {Approximation classes for real number optimization problems}, booktitle = {Extended abstract, 5th International conference on Unconventional Computation, York, UK, September 4-8, 2006}, editor = {Cristian Calude}, pages = {86 -- 100}, year = {2009}, }