The EC’s State aid rules apply to any subsidies granted by the Member States of the EU
Finding commentary on SOLO
Subject searches to use in SOLO to find commentary in books (both e- and print)
Subsidies Law and legislation + European Union countries
Government aid -- Law and legislation + European Union countries
Economic assistance, European -- Law and legislation
Subsidies - European Union countries
European State Aid Law and Policy by 
European Union Law of State Aid by In addition to subject searches using subsidies or government aid, it is also worth trying
World Trade Organization -- Rules and practice
and/or Foreign trade regulation
and/or International trade
The Definition of Subsidy and State Aid: WTO and EC law in comparative perspective by 
The Law of Subsidies under the GATT/WTO System by 
WTO Agreement on Subsidies and Countervailing Measures : A Commentary by