Two Logical Hierarchies of Optimization Problems over the Real Numbers.

Uffe Flarup Hansen Klaus Meer Two Logical Hierarchies of Optimization Problems over the Real Numbers. 459-470 2005 conf/mfcs/2005 MFCS http://dx.doi.org/10.1007/11549345_40 db/conf/mfcs/mfcs2005.html#HansenM05