Contracting cleaning services in a European public underground transportation company with the aid of a DSS.

Antonio Jiménez Alfonso Mateos Sixto Ríos-Insua Luis Carlos Rodríguez Contracting cleaning services in a European public underground transportation company with the aid of a DSS. 1485-1498 2007 43 Decision Support Systems 4 http://dx.doi.org/10.1016/j.dss.2006.06.010 db/journals/dss/dss43.html#JimenezMRR07