Publications Office, European Union, EU

EU: Policy on Public Procurement
europa.eu/pol/singl/index_en.htm
europa.eu/publicprocurement/index_en.htm

NUTS: Nomenclature of territorial units for statistics / Statistical Regions of Europe
ec.europa.eu/eurostat/ramon/nuts/basicnuts_regions_en.html

Single European market: Public procurement
ec.europa.eu/internal_market/publicprocurement/index_en.htm

IDABC: Interoperable Delivery of European eGovernment Services to public Administrations, Businesses and Citizens.
ec.europa.eu/idabc/eprocurement

PPN: European Public Procurement Network is a co-operation network of public procurement expert officials, dedicated to European companies, also has links to the national public procurement portals.
www.publicprocurementnetwork.org

SME portal: access to information to Europe's small and medium-sized enterprises
ec.europa.eu/enterprise/sme/index_en.htm
Solvit: Internal Market Problem Solving System
ec.europa.eu/solvit/site/index_en.htm

Your Europe - Business: to carry out company business in another country.
http://ec.europa.eu/youreurope/business/index_en.htm

e-CERTIS: documents / certificates for international procurement
e-CERTIS provides detailed information on the certificates and documents commonly required in procurement in the various EU countries. It is targeted at national practitioners. It helps economic operators, when preparing a tender, to identify evidentiary documents fulfilling evidence required in a foreign call for tender. It helps awarding authorities, when receiving tenders, to identify and recognise forms submitted by foreign tenderers and to relate contents of partner country forms to local equivalents.
http://ec.europa.eu/internal_market/publicprocurement/e-procurement/e-certis/index_en.htm

Other links:  

PLAN Network - Procurement Law Academic Network

Seminars on European Public Procurement by the European Institute of Public Administration