@inproceedings{FlarupHansenMeer2009, author = {Uffe Flarup Hansen and Klaus Meer}, title = {Two logical hierarchies of optimization problems over the real numbers}, booktitle = {Mathematical Foundations of Computer Science 2005, 30th International Symposium, MFCS 2005, Gdansk, Poland, August 29 - September 2, 2005}, editor = {Joanna Jedrzejowicz}, pages = {459 -- 470}, year = {2009}, }