Aïda Kharrat Habib Chabchoub Belaïd Aouni Soulef Smaoui Serial correlation estimation through the imprecise Goal Programming model. 1839-1851 2007 177 European Journal of Operational Research 3 http://dx.doi.org/10.1016/j.ejor.2005.10.004 db/journals/eor/eor177.html#KharratCAS07